(1)“must+have+done”表示对过去事情的肯定推测,译成“一定做过某事”,该结构只用于肯定句。 (2)“can't+have+done”表示对过去事情的否定推测,译成“不可能做过某事”。 (3)“can+have+done”表示对过去行为的怀疑,用于疑问句,译成“可能做过……吗?” (4)“could+h...
2. 与完成时有关的时态 ★现在完成时(have done) since, for/ in the past few months, up to now 例 1:Collecting toy cars as a hobby becomes increasingly popular during the past fifty years. A B C D 例2:English ___ in a new way at my college in the past...
1.should have done =ought to have done 本应该做而没做 2.would have done = 本来就会去做某事而没做 3.could have done = 本可以做某事而没做 4.might have done 本可以做而没做 例:They ought to have apologized. 他们本该道歉的。
2.时间状语:recently, lately, since, for, in the past few years, etc。 3. 基本结构:have/has + done 否定形式:have/has + not +done。 一般疑问句:have或has。 4. since的三种用法 1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half ...
3) “感使动词”(feel, hear, listen to, let, have, make, see, watch, notice, look at)真奇怪,主动结构“to”走开,被动结构又请来,十个动词要记牢,不会被它再难倒。 We saw him play...
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