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澳门百老汇网投app-“情态动词+have done”用法总结

2020-01-10 14:24:01 来源:南市资讯

澳门百老汇网投app-“情态动词+have done”用法总结

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最易念错的100个常用单词

掌握“美式发音”技巧,一个句子就go了!

1小时突破音标重难点

【归纳】

★could have done可以表示“过去本来能够做某事而实际上没有做”。如:

i could have come here a little earlier, but i'm late because of the bad traffic.

★must have done表示对过去已经发生过的情况的肯定推测,语气较强。如:

she must have received the book; i sent it a month ago.

★may / might have done表示对已经发生过的情况的肯定推测,语气稍弱。might have done还可表示“本可能做某事而实际上没有做”。如:

she didn't come on time. she may / might have missed the bus.

he might have given you more help, but he was very busy then.

★should / ought to have done表示“本该做某事而实际上没有做”,其否定形式表示“本不该做某事而实际上做了”,通常含有责备的意思。如:

the flowers have died. i should / ought to have watered them often.

you shouldn't / ought not to have told them the truth.

★needn't have done表示“本不必做某事而实际上做了”。如:

it is warm today. you needn't have worn your coat.

注意:didn't need to do与needn't have done都表示“过去不必做某事”,但didn't need to do通常表示“没必要做,实际上也没做某事”,而needn't have done则表示“虽然没必要做,但已经做了某事”。如:

he didn't need to get up early on sunday, so he stayed in bed until 10 am.

it's only five minutes'walk. we needn't have taken a taxi.

【即学即练】用“情态动词+ have done”结构完成下列句子。

1. you ________ (wash) the wound with cold water, but you used hot water.

2. i am not feeling well in the stomach. i ________ (eat) so much just now.

3. there was enough time. you ________ (hurry).

4. i ________ (lend) you the money. why didn't you ask me?

5. they ________ (go) out because the light's out.

【即学即练】

1. should / ought to have washed

2. shouldn't / ought not to have eaten

3. needn't have hurried

4. could / might have lent

5. must have gone

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