的过去式和过去分词,过去式和过去分词是什么?( 四 )


draw—drew,grow—grew,know—knew,throw—threw(动词show除外,show—showed)
8.动词原形中的eak改为oke,变成过去式 。如:
break—broke,speak—spoke
9.动词原形中的ell改为old,变成过去式 。如:
sell—sold,tell—told
10.以ought和aught结尾,且读音是〔 :t〕的过去式 。如:
bring—brought,buy—bought,think—thought,catch—caught,teach—taught
11.以ould结尾且读音为〔ud〕的情态动词过去式 。如:
can—could,shall—should,will—would
12.在动词原形后加d或t变成过去式,并且发生音变 。如:
hear〔hi 〕—heard〔h :d〕,say〔sei〕—said〔sed〕,
mean〔mi:n〕—meant〔ment〕,dream—dreamt 〔dremt〕
13.动词的过去式与动词原形一样 。如:
cut—cut, hit—hit, hurt—hurt, let—let,must—must,
put—put,read—read〔red〕,set—set
14. 动词的过去式有两种形式 。如:
dream—dreamed/ dreamt learn—learnt/ learned shine—shone/ shined
smell—smelt/ smelled wake—woke/ waked
15.不符合上述规律的动词过去式 。如:
am,is—was,are—were,build—built,do—did,eat—ate,fall—fell,
feel—felt,find—found,fly—flew,go—went,have /has— had,hide—hid,
hold—held,lay—laid,leave—left,lie—lay,lose—lost,make—made,may—
might,run—ran,see—saw,smell—smelt,take—took,wake—woke,
wear—wore
When的用法:
when可作疑问副词,也可作连接词引导多种从句,在多项语法中都有涉及,也是高考的重点 。下文是对when用法的总结 。
1.引导特殊疑问句,可译为“什么时候”
When do you think the patient can be operated on?你认为应该什么时候给病人做手术?
2.可引导不定式短语做主语或宾语
Ask him when to open the red wine.问问他什么时候打开红酒.
When to put the new school to use will be announced tonight.新学校什么时候投入使用将在今晚宣布.
3.可引导限定性和非限定性定语从句,修饰主句中表时间的先行词,并在从句中做状语 。
There will be one day when the impossible today may become possible.(限定性定语从句)将来会有一天今天不可能的也许会成为可能 。
We will put off the picnic until next week,when the weather maybe better.(非限定性定语从句)我们将把野餐推迟到下星期,那时候天气可能会好一些 。
4.引导名词性从句
1)引导主语从句
When the foreign friends will arrive is not known yet.外国朋友什么时候到还不知道 。
2)引导宾语从句
Lily is asking when she can go back to her hometown again.莉莉问她什么时候可以再回家乡 。
3)引导表语从句
That was when I was thirteen.那是我十三岁时候的事了 。

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