问题 have gone to和have been to的区别

求详细解释关于have been to和have gone to的区别? 为什么前者表示回来了? 后者表示去了没回来？

问题 have to be pp与be to be pp的区别

The problem is still to be studied in depth.The problem has still to be studied in depth. 上面两句哪句对？都对吗？若是这样，那have to be pp与be to be pp的区别是什么？

问题 too...to还是enough to?

...句子） This sofa __________________________________（改写） A. is too wide for three people to sit it. B. is too wide for three people to sit. C. is wide enough for three people to sit it. D. is wide enough for three people to sit in. 我感到哪个答案都不对，请专家指教。谢谢...

文章 so as (not) to…能否位于句首

so as (not) to…能否位于句首   ■倪肖丁（西安）   曾获全国“优秀畅销书奖”的《薄冰高中英语语法详解》（山西教育出版社，2008。p.208）明确指出：so as to不放在句首。并给出例句和说明如下：In order not to forget it, I’ll writ...

问题 reply to my letters中的to能省略吗

None of my letters have been replied to.这是个书上的句子，请问老师  to 能省略吗？还是说一定要有，为什么一定要有呢？不理解。谢谢专家。

问题 to the extent和to the extent that在句中的用法

The Consultant represents and warrants that, except to the extent③ expressly agreed by the parties in writing: (i) no third party software or other Technology has been provided to the University, and (ii) any individuals performing work on behalf of the Consultant under this Agreement are employe...

问题 for和to用法

1.给某人展示某物show sth for/ to sb这时“给”用for和to都行，那么有哪些短语只能用to或只能用to？2.表示“给“对于”意时for和to有何区别?

问题 The ratio of boys to girls is about 2 to 1.请问一下第一个to可以换成with吗？

话题 appear to be / seem to be

问题 I never know who to speak to是什么意思

请专家老师翻译一下这个句子:I never know who to speak to.谢谢!

问题 翻译：What's the best park to go to?

What's the best park to go to? 这句话怎么翻译？

问题 be friendly to sb 中的 to sb是什么成分

在 be friendly to sb 中 to sb 是形容词的补语吗？或也可以说是状语？那这是什么状语？ We have to forgo the tie with other teams of different faiths.  with other teams of different faiths 是做什么成分？

问题 than used to还是than they used to（涉及比较从句的主语省略问题）

More people hope to live in the countryside than _______.A. used to      B. they used to请问答案是是选 A 还是 B？或是两者都可以？换句话说，在这类句子中，是用 than used to 还是用 than they used to？或是两者都可以？

问题 the version thought to be closest to the author's original now belongs to a national museum in Paris

thought to be closest to为什么？不是很理解

问题 as...as句型中，分句谓语动词省略或替换的疑惑

...or our discomfort （extends）?2) 该省略的谓语动词extends可以用does替代吗？即：Our concern about our fellow men extends only as far as our pocketbook or our discomfort  （does） ?3）是否意味着这种类型的(as...as)比较分句，如果分句的谓语动词和前面...