问题 however是连词还是副词的辨别

... long it takes. 无论要花多长时间，我们都得完成。2. However you look at it, it was a wicked thing to do. 不管你怎么看待这件事情，它都是一件缺德的事。朗文词典认为上面第1句中的 however 是副词，但第2句中的 however 是连词，实在看不懂！...

问题 be to do sth表计划和现在进行时表计划的区别

老师，当be to do sth 和现在进行时都表示计划时，它们俩有啥区别？

问题 be about to do sth可用于被动式be about to be done吗

The students are about to be shown how hard the test is.这个句子符合英语习惯吗？我是说这里的 be about to do sth 用了被动式，好像很少见吧！

问题 There be句型加to do/to be done/done的区别

There be sth to doThere be sth to be doneThere be sth done请问这三个句子有什么区别？

问题 此处是否需要保留to?

...一个例句：Like teen-nagers everywhere, Jody and Sandy did not always do exactly what their parents told them to.请问句末的to 是否需要保留？下面三句话是否都对？Jody and Sandy did not always do exactly what their parents told them to.Jody and Sandy did not always do exactly ...

问题 have to do sth可以用于过去完成时吗

have to 可以有多种时态用法，但可以用过去完成时吗？如果用过去完成时，那不是成了 had had to? 感觉好奇怪。

话题 It was my first time to do

话题 This is my first time to do

话题 have/had known sb/sth (to) do ...

话题 so as for sb to do sth

话题 It takes sb st to do sth

话题 involve sb to do sth有这样的用法？

话题 sb find it adj to do sth

问题 分析：If you should happen to see him

If you should happen to see Jim, give him my best wishes.请老师分析一下 If you should happen to see him, 谢谢！

问题 seem not to do sth的用法问题

Terry has been carrying a torch for Liz for years, but she seems not to notice. 请问这里为什么用 seems not to notice? 不是应该用 doesn't seem to notice 吗?