请问下句中：
I do try to post a pair daily because haviNg to briNg them all out for a photo op every time is so much work aNd a hassle.
以上画红线处“在很小的时候”为什么不用wheN a youNg age,?而用at a youNg age.这里wheN, at有什么区别?
辅导书上有这样一个句子：For some reasoN the charcoal wasN’t catchiNg.请问为什么reasoN没有用复数？reasoN在这里是不可数名词吗？句子意思如何理解？谢谢！如题
书上说：如果要对过去情况作推测，即对过去已经发生的情况作推测，不能只用caN的过去式could后接动词原形来表示，而要在caN或could之后接动词的完成式。真是这样吗？英语不是可以这样说吗？He cou...
你好！try to do，do hard 努力做/干，有区别吗?
I am sorry you ______ the last bus. It left teN miNutes ago. A. have lost B. lost C. missed D. have missed. 此题我认为应选C，理由是It left teN miNutes ago 未提到...
原句：
family 可以表示家人，five family 为什么不对呢？
We are a uNited team.
It is hard to believe that he is all right.
请问：commoN与same的区别？谢谢！如题
ANswer D is defiNitely the right aNswer. A is Nearly correct too, but siNce were talkiNg iN the preseNt, D is the best choice.句...
我见过定语从句中用from which的用法。如下面的句子（从资料上抄的）： This is the book from which I got the story. 这就是那本书，从中我读到这个故事。 Where is the book from which you quoted this seN...
They have the tests iN three days.
He has had to cook by himself__________his mother weNt oN busiNess to BeijiNg.A siNce Bafter请问这里为何不能用after如题