...果表现在或将来的假设情况时，使用be式虚拟或推定should+do，例如:Though he stand/should stand alone, he will never yield.但是even if/even though引导让步状语时，为什么不符合上述规律，却可以使用were式或were to+不定式，例如：I shouldn't have ...
...在 concentrate
on / upon 后接动名词，注意不能说 concentrate to do sth。如：Just concentrate on doing
your homework. 集中精力做作业。They are concentrating on
saving life. 他们正全神贯注地救人。Just try to concentrate on
hitting the ball. 尽量集中精神把球击...
...It takes
about one hour and ten minutes.即属于该句型。）~ sth to do sth It takes about half an hour to get to the
airport. 到机场大概需要半小时。 That cut is taking a long time to heal. 那伤口需要很长时间才能愈合。~ sb sth (to do sth) It took her three hours ...
...：这道题选择一般将来时还是现在完成时The children are to do their homework the moment they ______ back school.A. have arrived B. had arrivedC. will arrive D. would arrive这道题...
...experience to work for so little money.如果little表示“小”，它是形容词，意为small, young, unimportant，short in time/distance等。这时候可数名词复数或不可数名词前可用such
little修饰。例如：Well now, one surely would have thought that
for such little things ...
...ard together. "We thought that was the sort of thing
married people should do."she says,"We learned pretty quickly that we
both had very different approaches to money."二十年前，当Wendy23岁时，嫁给了她24岁的丈夫jim，这对夫妻一起开了一张信用卡。“我们想那类事情...