Mary ought to have been here by now.Iwonder what's happened to here.

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• let祈使句改not形式!Let me help you.让我来帮你Let Mary come here.让玛丽到这儿来Let someone open the door.让人把门打开吧Let me be heard.听我说Let this be done.做这件事(应该做这件事).Let's not waste our time doing such things.咱们别浪费时间做这种事情了 Let’s go.Let’s not go now.咱们现在先别走Let me help you.让我帮你吧 Let me see.让我想想Let me have a look.让我看看Let me alone.别管我Let him not go.别让他走Let me have a try.我来试一试来源：Let her do what she likes.让她做她想做的事吧Let every man do his best.让每个人人尽其才来源Let you and I try to make this
• Mary ought to have been here by now.Iwonder what's happened to here.
• Mary ought to have been here by now.Iwonder what's happened to here.
• --- Where __you __ (put) the book? I can’t see it anywhere. --- I ___(put) it right here. But now it’s gone. A. did ; put; put B. have; put; put C. did; put; have put D. have; put; have put 2. We haven’t heard from Jane for a long time. What do you suppose _______ to her? A. was happening B. happens C. has happened D. happened 3. Hello, I ____ you were in London. How long _________ here? A. don’t know; were you B. h
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