how long...含义以及时态

how long...含义以及时态 how long用在什么时态里? how long were you there 是什么时态,能等于什么 How long have you had a stomachache?这是什么时态 How long have you been doing是什么时态的句子?这个时态怎样构成? how long与how soon,how ofen 各有什么含义及用法 How long have you been skating?How long did you skate?中文翻译的区别以及语法的区别是什么? how long will the offer remain good?以及how long does your offer remian open?中的open how long have you been like this?为什么用完成时态?请类似的举例 时态：how long do you think the meeting_(last)?请说明原因 谢谢 请问这里用什么时态,为什么?How long ____ your aunt _____(keep) this book? 一句话的时态问题How long have you been stay here?请问这句话是什么时态,并且说出这种时态如何使用, How long will you stay here?和How long will you be staying here?的用法区别?我指除时态之外的区别 以及时态的判断 这几个英语句子有什么区别How long do you learn EnglishHow long have you been learning EnglishHow long are you learning English还有 How long have you learned English?不用进行时态可以么 有什么区别 How far is it与How long is it的区别,以及他们的同意句分别有什么? —How long have you had the bike?—Since last week什么时态为什么用have和had？ 为什么填时态时看到how long就要用现在完成时,一般先现在是也是可以的呀.