各时态 被动语态的用法：
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+ z$ s. f8 G9 j" `5 V9 g9 v. F& a1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词 & I5 _: n  b9 F: N( f+ ~

* Q. E  ^+ U- iOur classroom is cleaned everyday. 3 L6 o4 r, Z% K% ?& d. L, U6 \
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I am asked to study hard.
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Knives are used for cutting things. 0 @! p% u% b5 K' I0 \& T4 W
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2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词 . g1 ?8 a9 U; y7 U. Z7 W
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A new shop was built last year.
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" f( `, l& n' Y/ y" ADinosaur eggs were laid long long ago. ! Y) T. O0 P/ T0 W4 `+ Q$ J0 p9 D

/ D* W5 s9 w2 f2 f3. 现在完成时的被动语态构成：has / have + been + 及物动词的过去分词
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This book has been translated into many languages.   U/ Y4 k: y# s
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Many man-made satellites have been sent up into space by many countries. 6 W* p& @) F8 y0 G- L
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4. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词 6 P" Q3 F7 K' w7 C

. M" p' }7 O# P9 ]4 P( eA new hospital will be built in our city. 8 ~" Z5 V7 i! C  K& d: b

" F) p& d7 K! ]7 O/ s. |" h$ \" FMany more trees will be planted next year. 2 N" a: v; `1 s1 ~8 S9 h7 G* P
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5. 含有情态动词的被动语态构成：情态动词+ be + 及物动词的过去分词 + H& _; ^& j: K- |/ F3 G. r4 V

0 E* G! U3 l! G( s% q0 _Young trees must be watered often. / x0 O% T! K9 z- b

+ [9 C( k: O5 {0 A3 FYour mistakes should be corrected right now.
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The door may be locked inside. 5 x, n- S% j0 `0 H5 c9 K- N% I/ s4 _# f
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Your homework can be handed in tomorrow.
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6. 现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词
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Uncle Wang is mending my bike now.→
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4 d  w7 @% C2 l5 q) N# O  X5 iMy bike is being repaired by Tom now. - s2 R% Y% X3 e& i& [: D
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They are planting trees over there. →
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Trees are being planted over there by them.
! X; g: ~9 w5 n9 q' T, P/ h二、 怎样把主动语态改成被动语态? " C7 m- n% U' u
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把主动语态改为被动语态非常简单，可以遵循以下几个步骤：
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! A  ?% z- J' `" h" R' x8 `5 M  o1. 先找出谓语动词；
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2. 再找出谓语动词后的宾语；
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( F% x3 T3 y2 \& f' B4 n: j3. 把宾语用作被动语态中的主语；
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4. 注意人称、时态和数的变化。 , V' U9 j+ k% P; p0 G% C
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例：1. Bruce writes a letter every week. →A letter is written by Bruce every week. # d( O. `5 x; U1 d& w( \
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2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning. : ~7 G- B& T5 I3 V- J* G; {

* A6 J# g8 W& K* T7 N3 ~3. He has written two novels so far.→Two novels have been written by him so far.
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9 U; V! C9 C( F. h/ l+ u4 M4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.
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$ ]/ ]# E3 H/ o; R# a: x5. Lucy is writing a letter now.→A letter is being written by Lucy now. - w4 a. n, |" h+ W  Q- H
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6. You must lock the door when you leave.→the door must be locked when you leave. # G% h& ]2 V8 j8 a
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三、 使用被动语态应注意的几个问题：
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1. 不及物动词无被动语态。 ! M9 W/ e; ~8 q

" ?9 f" B: J& t& f. kWhat will happen in 100 years. " ^1 ]6 Z8 I1 x% S( o; k7 e+ C
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The dinosaurs disappeared about 65 million years ago.
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4 H$ |& v* f; S( P" V2. 有些动词用主动形式表示被动意义。 5 w7 r2 {0 d0 J9 R) m9 E

% E1 i5 D4 |7 K8 j) R# n6 Y3 JThis pen writes well. ) u' t7 C, V0 g, c( m% C
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This new book sells well.
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' D  y$ w/ X' ?- g+ b$ H3. 感官动词或使役动词使用省略to的动词不定式，主动语态中不带to ，但变为被动语态时，须加上to 。 ' q- H& {( L( `; r$ `

' n9 }! \% z& g) ~4 l0 b; j/ S  R例：make somebody do something→somebody+ be +made to do something * ^5 Z( @6 k! a
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see somebody do something→somebody +be +seen to do something
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A girl saw my wallet drop when she passed by.→My wallet was seen to drop by a girl when she passed by.
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The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
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4. 如果是接双宾语的动词改为被动语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词是由与其搭配的动词决定。 ( `* Q9 E1 ]. _0 m* Y

' v6 I& W8 t& I4 x% xHe gave me a book.→A book was given to me by him. $ u1 c1 E5 p1 y  S2 k
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He showed me a ticket.→A ticket was shown to me by him.
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9 w( S9 N" I  U; b7 fMy father bought me a new bike. →A new bike was bought for me by my father.