a couple hours 为什么不用 a couple of

a couple hours 为什么不用 a couple of we talk for a couple of 只见过some hours,several hours,hours,就是没见过a couple of hours,我理解这句话意思是我们谈了好长时间,但为什么不用hours,而用了a couple of hours? a couple of hours..A couple of hours later it is all over with.这里后面为什么要加个with,这个with是什么意思,可以不加吗. I am free for a couple of hours. I am free for a couple of hours. I watch more than three hours of tv a day.这里为什么用of不用three hours for tv a couple I take a couple of hours off this afternoon?这里的off是什么 词组? a couple of hours是两小时还是口语的几个小时、两三个小时? just spend a couple of quiet hours before heading home in the evening的翻译 practice a for couple i the of piano hours day every The fish(has been dead)for two hours and a half.为什么不用has died? The fish(has been dead)for two hours and a half.为什么不用has died? the rain would stop in a few hours.为什么不用will要用would How many minutes in an hours 为什么用an而不用a呢 With the meeting ____in just a couple of hours ,I hadn't the time to worry about those unimportant things.A.begunB.beginningC.would beginD.to begin为什么不选C? 动词不定时的用法with the meeting ______ in just a couple of hours,I hadn't the time to worry about those unimportant things.A.begun B.beginning C.would begin D.to begin 为什么要选 D All we are planning to do is watch a couple of DVDs.请问为什么这里用watch 不用to watch 或是 is watching?