must+动词原形对现在的推测,must be+现在分词对未来或现在正在进行的推测。例如:
She looks happy; she must be having a good time.
4.neednt+动词完成式和didnt need to do
A.neednt+动词完成式表示一种已经做过的但并无必要的行为。例如:
You neednt have watered the flowers, for it is going to rain.
你本来不必浇花的,因为天要下雨了。(但却浇了)
We neednt have told him the news because he knew it already.
B.didnt need to do结构表示没有必要做某事,实际上也没有做。例如:
I didnt need to clean the windows.My sister did it.
我不必擦窗,我妹妹擦了。(我没有擦)
5.should+动词完成式
A.此结构的肯定式表示应该做的事而没有做,否定式表示某种行为不该发生但却发生了。例如:
You should have given her more help.
你应该多给她一些帮助的。(但没有给)
B.表示推测,意为可能,但可能性较小。例如:
He should have finished the work by now.
他现在该把工作完成了。(推测)
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