when will mary be back. 为什么back前要加be动词?

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• [紧急求助]英语中的被动语态为什么有时动词过去式前加be动词而有时不用?要如何理解
• 1.When you are still a baby,mother（ ）as good care of you as possible..A.take B.took C.takes D.taking （Q：前面的句子表示的是过去,为什么后面take不用过去式?）2.She always stands in the wind（ ）for you back from school.A.looking B.look C.wait D.waiting（Q：为什么动词后要加ing?哪里表示要这样变形?）3.Mother is always ready to give everything she has （ ）her children,not to receive.A.for B.to C.of D.with（Q：为什么用to而不用for?）C D B
• About the problem,we must take immediate actions.上一句 为什么一定要加take 我看到好多动词前都要加 take 而有的却不要加 什么情况是要加take的
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• when 与 be的一些基本搭配用法和其他的一些小问题在when与be后面的紧跟的动词是不是一般都变成v-ing 这种用法?还有几个句子的问题Young people should be given opportunities to stand before counters,____(看着)at different foods and .这里划线填的look为什么要加ing呀 No car are allowed on this island,making it ideal for walking 这里的making是不是也是同样的道理The report urged that all children ____(teach)to swim 这里填 should tought 为什么teach要变成tought?That beggar seems not to have eaten anything yesterday .这里为什么是seems not to have ...而不是seems t
• And thank you for giving it to me.Barry:You know,you were right?I mean,I thought we were happy.We weren't happy.But withMindy,now I'm happy.Spit.Rachel:What?Robbie:Me.(Spits.)Rachel:Anyway,um,(Gets the ring out of her purse.) I guess this belongs to you.And thank youfor giving it to me.Barry:Well,thankyou for giving it back.这里的give为什么要加ing?
• 请教几道英语改错题每句有一处错误 1.I left school as soon as I can and started work.(答案是把can改为could,但是start后不应该加动词不定式或ing形式吗）2.The crowd waitingto greet them in England was very surprised see this when the balloon landed in front of them.(答案是在see前加 to,我想问一下除了改这个为什么不把was改为were
• shock这个词是 及物动词,但是为什么要加be呢?比如说 I was shocked when I heard this news.这里的 be + shocked 里的 shocked 是由动词变形容词么
• they will be back in two weeks 对划线部分提问 __ __they be back?——————划线部分是 in two　weeks
• can they finish the work?与I wondered _ _ _finish.如何同意句转换