So the U.S. Surgeon General has suggested that e-cigarettes may be a useful toolfor adults trying (try) to end their tobacco use,or quit.为什么空格部分不能用不定式to try?（空格部分为 trying）
The people that are participating are negative either on Thursday or on Friday.Even if they would have caught a corona infection last night, they would be not - be infectious today.对于：Even if they would have caught a corona infection last night, 其中would have caught: 这是表示站在...
...法有一点疑问，自己不太懂。But it is interesting to note，in the present research，that monkeys
respond to stimulation in two to four seconds.这个句子出于美国动物世界！我想问下、这里in two to four seconds是点时间还是段时间？另外：这里的动词是respo...
Without a word more spoken, she left the meeting room.她没再说什么话就离开了会议室。（without+名词/代词+动词的-ed形式）这例句中 without a word more spoken,为什么不能写成without a more word spoken,“再没说一个字”，这样不是更加简单明了而且more...
They were forced to spend another uncomfortable night at the airport waiting for their plane. 为了等飞机，他们只得又在机场挨过了难熬的一夜。请问句中的 waiting for their plane 与动词 spend 有关吗？换句话说，它是属于 spend time doing sth 句式吗？...
Ladies and gentlemen,please fasten your seat belts.The plane ______.A. takes off B. is takingoff C. has taken off D. took off 答案给的 B（出自语法网）。但参考语法网“一般现在时与现在进行...
...丈夫病了真是遗憾。It was pure luck that he found money lying on the street. 他在街上捡到钱完全是靠运气。It was rather a coincidence that she appeared at that exact moment. 她正好在那个时候出现真是巧合。这些引导主语从句的 that可以省略吗？可以或...
...a.m. 和 about 3.30 p.m.前面可以加介词at吗？I was very happy with the school hours in Britain because school starts around 9 a.m. and ends about 3.30 p.m. 我很喜欢英国中学的作息时间，因为学校每天上午大约9点上课，下午大约3点半放学。句子来源...
1//rather than do something属于不定式作介词宾语的范畴吗？类似but to do ,except to to？
1//对于more than的以下的用法，than是什么词性呢
1后接形容词，
▷They were more than glad to help us.
2后接副词或分词
▷Thegirl was more than slightly hurt.
...
The reason I’m phoning you is to invite you ______ a party.A. to B. for答案是 to，但为什么不能是 for 呢？下面这样的句子不是用的是 for 吗？Why don’t you invite him round for dinner? 你为什么不邀请他来家里吃晚饭呢?