1.I thought if I go to sleep,I will idle away my time 应该是:I thought if I went to sleep,I would idle away my time
2.What’s more,some of my classmates also stayed up late at that time,at that time应该改成 as well
3.at Grade 8是 in Grade 8
4.But fortunately 把but去掉
5.keys改成key
恩,应该不会吧.对过去的虚拟,应该是I thought if I had gone to sleep,I would have idle away my time 因为前边是thought而不是think
那个key 如果作为答案的意思是可数名词,但是句意不符,可以理解为关键,重点.此时是不可数的.
你觉得呢,以上只是个人理解