must have done 和must have domust have done是对过去的肯定猜测must do 是对现在的肯定猜测吗?一定是 “肯定 ”

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must have done 和must have domust have done是对过去的肯定猜测must do 是对现在的肯定猜测吗?一定是 “肯定 ”
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must have done 和must have domust have done是对过去的肯定猜测must do 是对现在的肯定猜测吗?一定是 “肯定 ”
must have done 和must have do
must have done是对过去的肯定猜测
must do 是对现在的肯定猜测吗?一定是 “肯定 ”

must have done 和must have domust have done是对过去的肯定猜测must do 是对现在的肯定猜测吗?一定是 “肯定 ”
是的,一定是肯定.
must have done 表示 猜测过去一定是做过了什么事情.
例如：
The ground is wet.It must have rained last night.地面很湿,昨晚一定是下过雨了.（肯定性的猜测）
must do 表示 现在一定要做某事
例如：
I must go home now.我现在必须要回家了.（肯定性的表达）

must典型用法之一就是【用于肯定句，表示肯定性推测、判断】。
must do sth 对现在情况的肯定性推测判断
must be doing sth 对此时此刻正在进行情况的肯定性推测判断
must have done sth 对过去情况的肯定性推测判断
这些都是【肯定的】，翻译为【准是；一定】。
T...

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must典型用法之一就是【用于肯定句，表示肯定性推测、判断】。
must do sth 对现在情况的肯定性推测判断
must be doing sth 对此时此刻正在进行情况的肯定性推测判断
must have done sth 对过去情况的肯定性推测判断
这些都是【肯定的】，翻译为【准是；一定】。
Tom must be watching TV now,for he often watches it at this time.
祝你开心如意！

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