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

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• 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
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• 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?
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