do的被动,do模式

do的被动,do模式

He is to do the work.The work is to be done.They should do it at once.---It should be done at once.考点四：由第一步得知无宾语的动词则不可以变为被动语态，像“主语+系动词+表语”和“主语+不及物动

be(am is are) / do 被动：am/is/are done be(was were) / did 被动：was/were done will do 被动：will be done would do 被动：would be done be doing 被动：am/is/are being don1.不定式to blame, to let用作表语时，通常要用主动表被动。如：Who is to blame?该怪谁呢？The house is to let.此屋出租。2.某些“be+形容词+to do”结构中

sb/sth+have/has+sth to do.也是表示被动。比如I have so much work to do.我有那么多活要干（一般将来时的被动语态，我们说一般将来时呢叫做will do,那它的被动语态呢其实特别好变，把所有的do变成be done,这就是被动语态了，那will do当然是一个单独的，也

1.一般现在时(do); 2.一般过去时(did); 3.一般将来时( will do)(be going to do)(am doing); 4.一般过去将来时( would do); 5.现在进行时( be doing); 6.过去进行时(was/were③一般将来时：主动句will do被动句will be+done ④现在进行时：主动句am/ is are+doing被动句am / is are+being+done ⑤过去进行时：主动句was/ were+doing被动句was/ were+bei

C. to be done D. to do 此题答案是选择C,need作为实意动词，后面加不定式，如果不定式的逻辑主语是不定式所表达动作的承受者，不定式要用被动形式。例如：The nex1、一般现在时(do)。2、一般过去时(did)。3、一般将来时( will do)(be going to do)(am doing);4、一般过去将来时( would do)。5、现在进行时( be doing)。扩