1.He said we had met 2 weeks before.2.We had met 2 weeks before.3.It had been fine the week before.请教老师2 weeks before 与 the week before 都是过去的一段时间，为什么第二句不对，第三句对呢？
...f World War II, at a time when newsprint was dirt-cheap and stylish arts criticism was considered an ornament to the publications in which it appeared.为什么这里的同位语能够用介词短语表达呢？
...revious role at Intel, he was
involved in enabling proactive data-driven IT initiatives using natural
language processing, deep learning, and traditional statistical methods】我想问：1. 这里的 enable 应该如何翻译？2. 此处的 using 是现在分词作伴随状语吗？谢谢老师...
With each partner being able to see what is paid and
when each month, conversations will naturally arise-and each partner is more
likely to be on the same page and have a firmer understanding of their
household's holistic financial picture.这句话的when each money是不是省略了when is it?
In itself，it‘s not a difficult problem to solve，这里in itself明显是状语，但在Science communication is a science in and of itself句子中in and of itself还是状语还是定语？这里of是什么意思？
...理。【我的译文】The first sum of money in my
life is hard to earn. It is merely a little more than ten yuan made out of
blood and sweat indeed. But it is such experience that has made me understand a
truth to live by.[网友译文] I
sweated blood to earn my first paycheck. It was how I made...
Shanghai _______ (be) a small town hundreds of years ago.
Now it ______ (become) a large city.
第一空应是was,第二空应该是becomes还是has become？又或者两者都可以？盼望专家老师解惑。上一次学生打错字了，请见谅。
资料上有这样的正误句子：他有必要参加这次会议。误：He is necessary to attend the meeting.正：It is necessary for him to attend the meeting.原因是：necessary 这个形容词不能用“人”作主语。请问老师，这个解释有道理吗？