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must have done 否定是 need not have done吗。???
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推荐答案 推荐于2018-05-10
must have done的否定形式是can't have done.
用must来表示肯定、猜测;用can't 来表示动作不可能发生,如:
- that must be wrong.
- No, it can't be wrong.
过去式
举例:He walked past me without speaking. He can't have seen me.
couldn't have...可以替代can't have...
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第1个回答 2014-01-15
后面的格式是错的吧,need have not done 是否定的
相似回答
have
done
的
否定是
什么?
答:
1. should
have
done
表示“过去本应该做某事却未做。”其否定结构 shouldn't have done 表示 “过去本不该做某事却做了。”2. ought to have done 表示“过去本应该做某事却未做。”其否定结构 oughtn't to have done 表示 “过去本不该做某事却做了。”3.
need
have done 表示“过去本有...
could/might/may/would/
must
/should
have
+过去分词
答:
5. might (不能用 may)
have
done
表示“过去本可以做某事却未做。” 注意:其否定形式 might
not
have done 没有虚拟语气的用法,might not have done 只能表推测,相当于 may not have done,意为:“过去可能没有做某事。”
大家正在搜
must have done否定
should have done
couldnothavedone
must have done例句
must have done用法
there must have
must been done
might have done
could have done
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