"We needn't guard against one who calls himself a thief,but we should watch out for one who calls himself an upright gentleman."在这句话里能不能直接用watch out one?for起什么作用啊?

We needn't guard against one who calls himself a thief,but we should watch out for one who calls himself an upright gentleman.在这句话里能不能直接用watch out one?for起什么作用啊? We ________much sleep.(don't need,needn't) 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 We needn't worry about it.同义句转换 we needn't come to school every day同义句 You-------miss the lesson ,though we --------------have it on Thursday.A mustn't;needn't B needn't;mustn't C mustn't;mustn't D needn't;needn't Since we have enough money ,we ( ) more.该填needn't还是 don't need?为什么? Must we hand in our homework now?No,you needn't.解释一下为什么要用needn't. mustn't needn't guard We need some peneils.怎么变成否定句?最好是这个格式 We needn't( )pencils. We are l______ beacuse we needn't worry about not having anything to eat. 首字母填空 We _____ fight against pollution.A.may B.Should C.mustn’t D.needn’t 英语翻译needn't it needn't be people needn't needn't to you______ worry about your study.we will help you if necessaryA.don't need B.needn't C.needn't to D.need to