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语从句中。
(6) If he is here, we would know bow to do it.
答案：is改为were．虚拟语气用于条件句，与目前事实相反的一个假设，if从句的谓语动词用过去式，be的过去式用were。
(7) The teacher insisted that her students did their homework alone. 答案：did改为do．(should)do表示虚拟语气，用于insist后的宾语从句中。 (8) The woman talks as if she knows everything.
答案：knows改为knew．as汀引导的句子多用虚拟语气，用过去时态表示与目前事实相反。 (9) Have he had the time,he would have done it.
答案：Have改为Had．省略if的条件从句，原句为If he had had the time，表示与过去事实相反。
(10) Without electricity human life will be quite different today.
答案：will改为would／should／might．without短语相当于一个条件状语从句，上下句间构成了一个与现在事实相反的一种假设；主句谓语：would／should／might+v． 5.情态动词
(1)He will be back soon. You can't worry.
答案：high改为tall．形容细而高的东西用形容词tall． (2) I got lost and must ask a policeman the way. 答案：health改为healthy．healthy，形容词作表语。 (3) --Must I finish the work before I go home?
--No, you mustfft.
答案：many改为large．形容人口众多，用形容词large．
(4) Since the ground was wet this morning, it must rained last night. 答案：must后加have．must have done是对过去一个动作肯定的判断。
(5) I didfft need get up early this morning, so I stayed in bed until 9. 答案：need后加to根据didn't来判断，need为实义动词，后接不定式。
(6) Look at that thin man. He mustn't be Mr. Black, for Mr. Black is fat. 答案：mustn't改为can't否定的判断“不可能”用can't． (7) After meal,he should checked the bill.
答案：去掉should．表示陈述一个事实；或should后加have，should+have done表示“本
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应该干某事而没干”
(8) When Galileo told people of his discovery, no one should believe him. 答案：should改为would．would可以表示“愿意”。 (9) Would we go? Yes ,let's.
答案：would改为shall．shall用于一、三人称，表示请求对方允许或提出建议。would用于第二人称，Would you do．．．?
(10) How dares he speak to his mother like that? 答案： dares改为dare dare用作情态动词，无dares形式。 6.主谓一致
(1) Half of the apples is bad.
答案：is改为are．谓语动词的单复数与half of后的名词保持一致。或将apples改为apple． (2) Either Bob or I are to blame.
答案：are改为am．either．．．or．．，neither．．．nor．．．，not only．．．but also．．．等连接两个并列的主语，采用就近原则。 (3) Three feet are not long enough.
答案：are改为is．一段距离，一段时间，一笔钱等，都当作单数看待。 (4) Nothing but trees were to be seen.
答案：were改为was．nothing作主语，谓语动词一般用单数。 (5) The rest of the water are not enough.
答案：are改为is．therest作主语时，谓语动词的单复数取决于of后的名词。 (6) He as well as I are a student of English.
答案：are改为is．主语为He，主语后的介词短语with．．．，together with．．．，as well as．．．等不能改变主语的数。
(7) Doing morning exercises are good to us.
答案：are改为is．认—ing，t。d。等形式作主语，谓语动词用单数。 (8) Each soldier and each sailor were given a gun.
答案：were改为was．each．．．and each．．．，every．．．and every．．．作主语，谓语动词用单数。
(9) The old is taken good care of in our country. 答案：is改为are．“the+形容词”表示一类，谓语用复数形式。
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(10) What interests me most is better wages and working conditions.
答案：is改为are．what引导主语从句，谓语习惯上用单数，若表语为表示复数意义的名词时，谓语用复数。
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