Must we hand in our exercise books today?这里为什么是用介词in?

We must hand in our homework _____ time. Must we hand in our homework tomorrow改被动 Must we hand in our exercise books today? Must we hand in our exercise books today?中的HAND是什么意思 we have just received(?)that we must hand in all our baggage in no time We must hand in our homework ________( in time,on time). Must we hand in our exercise books today?这里为什么是用介词in? must we hand in our homework today?yes,you ____/no ,you _____ Need we hand in our homework now?肯定和否定回答分别是什么?Must we hand in our homework now?的肯定和否定回答呢? must we hand in our homework now?a.yes you mustn'tb.yes you mustn'tc.no you needn't Must we hand in our homework now?No,you needn't.解释一下为什么要用needn't. must we hand in our exercise books now; can you buy this kind of radio here,改为被动语态 We must hand in the homework in time.有错吗? 一道简单初中英语选择题4.Mr Robin, we must hand in our homework,________?No, You_____.A.needn't we ; must'tB.needn't we ; needn'tC must't we ; needn't 为什么 ——Mr John, we must hand in our homework today, ______? ……20.——Mr John, we must hand in our homework today, ______? ——No, you _____. But you must bring it to school tomorrow. A.needn’t we ; mustn’t B.mustn’t we ; needn’t C.mu We must keep our room clean.Dirt ...We must keep our room clean.Dirt and diseases go ___,you know.A.from time to timeB.hand in handC.step by stepD.up and down这道题选B,怎么翻译呢?Thanks! 1 A:We must hand in our homework after class.B:( )( )I2 We will go on doing our project tomorrow.改写句子We will go on ( ) the ( )tomorrow.3 In no time ,he changed his mind.( )( ),he changedhis mind 作这句话的否定回答（三个空）Must we hand in our exercise books today?No,you____ _____ _____.