March 2015
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  1. Bell the cat - To lead in danger (खतरे की अगवाई करना) : Every student dislikes the new principal, but nobody is ready to bell the cat by telling him so.
  2. Blow one's own trumpet - To speak boastfully about oneself (अपनी बड़ाई करना) : A person who always blows his own trumpet, is not liked by anyone.
  3. Bring to light - To make clear (स्पष्ट करना) : The manager tactfully brought to light the dishonesty of the clerk.
  4. Bad blood - Enmity (दुश्मनी) : One should not create bad blood among relatives.
  5. Bring home - To explain (समझाना) : She could not bring home the problem to me.
  6. Bad Bargain - Improper compromise (अनुचित समझौता) : His marriage with a widow has proved a bad bargain for his daughters.
  7. Between Scylla and Charybdis - Between two difficulties (दो मुश्किलों के बीच में) : If you take risk you will be in danger and if not then you will be called coward so you are between Scylla and Charybdis.
  8. By chance - By luck (संयोगवश) : He met his old friend by chance on the road.
  9. By degrees - By and by (धीरे धीरे) : He developed his knowledge by degrees.
  10. Catch a Tartar - Someone more powerful or troublesome (किसी को आशा से अधिक बलवान पाना) : In attacking India, Pakistan caught a tartar. 
  11. Castles in the air - Visionary schemes (हवाई किले बनाना) : Do not waste your time in making castles in the air.
  12. Carry coal to Newcastle - To provide something already present in abundance or foolhardy or pointless action(बेफिजूल  कार्य) : To carry water bottles in river areas is like carrying coal to Newcastle.
  13. Cock and bull story - False story (झूठी बात) : The tale of his heroism is nothing but a cock and bull story.
  14. Come true - Prove true (सत्य निकलना) : His dream about his success has come true.
  15. Cry for the moon - Wish for an impossible thing (असम्भव वस्तु की आशा करना) : A beggar cries for the moon if he wishes to have a car.
  16. Cut a sorry figure - To leave a poor impression (बुरा प्रभाव डालना) : Vimal stood up to speak but he was so nervous that he cut a sorry figure in the function.
  17. Chicken-hearted - Cowardly (कायर) : He is so chicken-hearted that he can do nothing adventurous.
  18. Child's play - Something very easy (आसान काम) : To pass the I.A.S. examination is not a child's play.
  19. Call a spade a spade - To call a thing as it is (साफ़-साफ़ कहना) : Bold persons fearlessly call a spade a spade.
  20. Cry over spilled milk - To feel sorry for the past (व्यर्थ पछताना) : You should not feel sorry for your failure, because it is only crying over spilled milk. 
  21. Cut the Gordian knot - Solve or remove a difficult problem (किसी कठिन समस्या को हल करना) : Let us hope that the prime minister will success in cutting the Gordian knot of black money and corruption in the country.
  22. Call names - To abuse (गाली देना) : Do not call anybody names.
  23. Call to account - To ask one to explain one's conduct (जवाब तलब करना) : The police officer called the bus driver to account for endangering passengers lives.
  24. Crocodile tears - False tears or sorrow (दिखावटी आँसू या दुःख) : The student shed crocodile tears over the incomplete assignment of final term.
  25. Catch red-handed - To catch while committing a crime (रंगे हाथों पकड़ना) : A thief entered my house last night but he was caught red-handed.
  26. Cast pearls before swine - To offer something to someone who cannot understand the value of that thing (अंधे के आगे रोवे अपने नयना खोवे) : Giving some good advice to a stubborn person is like casting pearls before swine.
  27. Cut and dried - Completely ready-made/ clear-cut (बिल्कुल तैयार) : I have got a cut and dried idea for solving your insurance premium problem.
  28. Come off with flying colours - To be successful (सफल होना) : Sita came off with flying colours in the final year of engineering.
  29. Call in question - To doubt (संदेह / शक करना) : How can you call in question the honesty of my office staff?
  30. Dead as the doornail - Quite dead (पूर्ण रूप से मरा हुआ) : Due to no rain, the plants were dead as the doornail.
  31. Die in harness - Die on duty (कर्तव्य या सेवा करते हुए मरना) : Many soldiers die in harness on the battlefield.  
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Rule 1: Active से Passive बनाते समय object को subject और subject को object के स्थान पर ले आते हैं तथा object के पहले प्रायः by लगा देते हैं । जैसे -
Active : Kumar writes a letter.
Passive : A letter is written by Kumar.

First Sentence में Kumar, subject है और letter, object है लेकिन दूसरे वाक्य में letter को subject तथा Kumar को 'by' preposition का object बना दिया है ।

Rule 2: दिए हुए verb, का Past Participle बनाकर उसके पहले उसी Tense का verb 'to be' (am, is, are, was, were, be, been, being) का रूप लगा दिया जाता है , जैसा की निम्न तालिका में दिया गया है :

TenseSimpleContinuousPerfectPerfect Continuous
am being 
is being 
are being
has been 
have been
Not Possible
was being 
were being
had beenNot Possible
Futurewill be 
shall be
Not Possiblewill have been 
shall have been
Not Possible

Present TenseActivePassive
SimpleHe kills a snakeA snake is killed by him.
ContinuousHe is killing a snake.A snake is being killed by him.
PerfectHe has killed a snake.A snake has been killed by him.

Past TenseActivePassive
SimpleHe killed a snake.A snake was killed by him.
ContinuousHe was killing a snake.A snake was being killed by him.
PerfectHe had killed a snake.A snake had been killed by him.

Future TenseActivePassive
SimpleHe will kill a snake.A snake will be killed by him.
PerfectHe will have killed a snake.A snake will have been killed by him.

Some More Examples :
1. Active : They believe me.
Passive : I am believed by them.
2. Active : He is praising me.
Passive : I am being praised by him.
3. Active : She gave me a book.
Passive : I was given a book by her.
                 A book was given me by her.
                 A book was given to me by her.
4. Active : He will help you.
Passive : You will be helped by him.

Note 1: Present Perfect Continuous, Past Perfect Continuous, Future Perfect Continuous तथा Future Continuous की passive voice नहीं बनती है ।

Note 2: केवल Transitive Verbs की ही passive voice बन सकती है Intransitive Verbs की नहीं । Intransitive verbs का object न होने से passive voice नहीं बनती है । 

Note 3: कुछ verbs के बाद passive voice में 'by' preposition के स्थान पर अन्य prepositions का प्रयोग होता है । जैसे -
(a) Surprised, astonished, disappointed, distressed, displeased तथा alarmed के बाद passive voice में 'at' का प्रयोग होता है । जैसे -

1. Active : Your intelligence surprised me.
Passive : I was surprised at your intelligence.
2. Active : His success astonished us.
Passive : We were astonished at his success.
3. Active : His defeat distressed me.
Passive : I was distressed at his defeat.
4. Active : This news alarmed his father.
Passive : His father was alarmed at this news.

(b) Known तथा obliged के बाद 'passive voice' में 'to' का प्रयोग होता है । जैसे -

1. Active : Everybody knows Gandhiji.
Passive : Gandhiji is known to everybody.
2. Active : He will oblige me.
Passive : I shall be obliged to him.

(c) Pleased, satisfied, disgusted, charmed, thronged तथा lined के बाद 'passive voice' में 'with' का प्रयोग होता है । जैसे -

1. Active : My behaviour pleased him.
Passive : He was pleased with my behaviour.
2. Active : Your work satisfies the officers.
Passive : The officers are satisfied with your work.
3. Active : Her sweet song charmed the listeners.
Passive : The listeners were charmed with her sweet song.
4. Active : The passenger lined the booking window.
Passive : The booking window was lined with the passengers.

(d) Contained तथा interested के बाद 'passive voice' में 'in' का प्रयोग होता है । जैसे -
1. Active : This box contains many beautiful things.
Passive : Many beautiful things are contained in this box.
2. Active : This book interests me.
Passive : I am interested in this book.

Note 4: कुछ Intransitive verbs के साथ prepositions का प्रयोग होता है । Prepositions के साथ मिलकर ये verbs Transitive verbs का काम करती है । Passive voice में preposition verb के साथ रहता है । जैसे -

1. Active : The girls laughed at me.
Passive : I was laughed at by the girls.
2. Active : He looks after my children.
Passive : My children are looked after by him.

Note 5: जिन Verbs के दो objects होते है , Passive voice में बदलते समय उनमे से कोई एक subject हो जाता है तथा दूसरा अपने ही स्थान पर object बना रहता है । जैसे -
1. Active : I taught him English.
Passive : He was taught English by me.
                 English was taught to him by me.
                 English was taught him by me.

Note 6: कभी-कभी Passive voice में काम करने वाले doer का प्रयोग नहीं होता, क्योकि वह important नहीं होता । जैसे -
1. Active : Someone has stolen my pen.
Passive : My pen has been stolen.
2. Active : People speak English all over the world.
Passive : English is spoken all over the world.

Also Read :
Active to Passive Voice : Tenses
Active to Passive Voice : Interrogative Sentences
Active to Passive Voice : Imperative Sentences
Active to Passive Voice : Some special cases

Transformation of Sentences in Hindi and English