求与 for hours and hours 类似的结构和意思
in two hours 和for two hours的区别
BUSILESS HOURS的意思
two and a half hours这种结构的构成
I skated for four hours与I have been skating for four hours的区
one and a half hours 和 one hour and a half的意思一样吗
has been waiting for hours和has waited for hours的区别?
sleep nine hours和sleep for nine hours
mark was patient enough to wait for he for five hours 句子的结构分
be sure 和 for two hours
in two hours 和in two hours' time的区别
more two hours和two more hours的区别
they need hundreds of hours of study and practic里面 的语法结构是什么?