为什么在句子中"We can't arrive late for class."中要用arrive而不用arrive in，arrive at，get to 等

为什么在句子中We can't arrive late for class.中要用arrive而不用arrive in，arrive at，get to 等 enough在句子中应如何使用.例如There isn't enough light so we can't see it clearly enough中,light是形容词,不是应该放在enough前面吗?为什么它放在enough后面(句子应该没错）?若light在此处作明亮(它是否有这 在句子中如何使用couldn't,mustn't,can't,needn't? 翻译句子中短语动词We can't [put off ] making a plan. don't touch what we don't need.为什么用what啊!急用!Don't touch what we don't need.在这个句子中为什么用what不用that啊,what在句中作什么成分啊? 门打不开了.这个句子The door won't open.中的won't能不能用can't,为什么?can't和won't各自的特点是什么?在使用中要注意什么,怎样区别? so we could hear the sound of running water although we couldn`t see it.为什么so和although可以放在一个句子中? perl中reverse用法问题在perl中 reverse遇到/bin/perl@arr = qw / a b c d/;chomp( @arr );@arr = reverse ( @arr );print @arr;上面能正确翻转数组 打印出 dcba如果我这样写：/bin/perl -w#print 输入字符串(ctrl+d结束): ;@arr can't. we. listen. music. to. now连成句子 有一个句子：if we ( don't） have a strong body ,we can not do things well.实义动词have的否定形式：don't have.那么在另一个句子中：Bob （had no） place to play but on the street.为何此句have 的否定形式不用don't h 用may提问的句子,否定回答怎么说?May we live the classroom now?No,you ___.___上填mustn't还是can't为什么 We can't eat____the classroom.填out还是outside?为什么? 用unless改写句子 We have enough money.We can't buy the car. 把这个句子变反义疑问句,We don't think we can finish it on time,.. 把这个句子变反义疑问句,We don't think we can finish it on time,.. afford的一个句子,i can't afford the time talking with her.这个句子里为什么用talking with her.能用to talk with talking with her在句子中又做什么成分?急用. Nothing can stop us,___?A can't it B can it C can't we D can we为什么选择他写下原因>_ We can call it for help 中it为什么放在for 后面