问一下几道题目的语法It is nearly nine now.He (hasn't come) yet.白痴的问一下有

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问一下几道题目的语法It is nearly nine now.He (hasn't come) yet.白痴的问一下有yet
It is nearly nine now.He (hasn't come) yet.白痴的问一下有yet了不是完成时了吗,为毛不是didn'nt?
when Alice got home,her mother (was doing) some (sawing)第一个括号里的东东是因为现在完成时才这样的吗?求讲解.还有第二个括号,像shoping,它的原型不是shop吗?为什么这里要从sew变sawing呢?
The policeman told the children (not to) play in the street.为什么这里是not to而不是do not?

didn't come 和hasn't come 意思不一样
hasn't come 是在当时说的,时间快要到了,他还没有来
didn't come指比如说第二天谈到那件事时,说他昨天没有来
根据题意用hasn't come
was doing 基本上可以说是一个固定用法
when ..., sb was doing sth
意思是当她刚回家时,妈妈正在做一件事
第二个空应该是填sewing吧,saw是锯子,妈妈应该不太可能在锯东西,sewing针线活更合适
sew是动词,sewing是动名词
tell sb to do sth
tell sb not to do sth 告诉某人不要做某事
如果一定要用do not,那应该是told the children：‘Do not play in the street.’

问一下几道题目的语法It is nearly nine now.He (hasn't come) yet.白痴的问一下有 It hasn't been decided yet whether/if he will come soon这句话的时 he hasn't come yet是什么时态? 求一道时态题目：Mr. Brown hasn't come yet. When he ___(come), we ___ he hasn't decided it yet.请译出 hasn't arrived yet 这句的语法讲解连词成句:seems,he,it,come,back,hasn't,yet. i don't know why he hasn't come yet. 问一下come ture 的用法 We have been waiting____us,but he hasn't come yet. 问一下这句话有没有语法上的错误 hasn't jim come yet?no and I （）for him for nearly 2hours