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问题 it作主语的用法

...board the rover, it may very well require the far more well-equipped laboratories and delicate instruments back here on Earth to tell us whether our samples carry evidence that Mars once harbored life. 请问老师们，这句话中it作形式主语，不定式作真正主语吗？还是说不定...

问题 first-ever与first的区别

Zhang Tian is planning to organise the first-ever school concert!这是高中英语新教材北师大版必修一第17页的一个句子。这里的 first-ever 意思是“第一次的”“首次的”，但查词典，first 也可以表示“第一次的”“首次的”啊，它们有什么区...

问题 Good decision 前面为什么不用不定冠词

Hi, Sam! I've decided to join the Music Club.—Good decision!上面的对话摘自2019版人教版高中英语新教材必修一的 Unit 1（p13）。请问：Good decision 前面为什么不用不定冠词呢？decision 不是可数名词吗？

问题 在表示用途时动名词和不定式的区别

请问老师It is the water to drink.和It is the water for drinking.这两个句子在表达意思上有区别吗?是不是不定式不定式倾向于表达目的，动名词倾向于表达用途？

问题 warn sb of/about sth

We warned our children of/about the dangers of playing in the street.Janet warned me about the water. She said it wasn't safe to drink.这两个句子中 warned 后面所接介词为什么有区别? 是warned of和warned about在意思上有什么区别吗?

问题 worth后面接不定式与动名词

The items exhibited are well worth ______, and attracted large crowds of visitors in the past few days.A. seeing    B. to be seen为什么标准答案是B呢？我理解是A are worth seeing 主动形式表被动含义呀？

问题 planned后介词短语的问题

... planned for early next year.the attack of the French V Corps, was planned to the east of Arras, in the area of Cambrai. 这两个句子中planned后的介词短语应该分析为时间/地点状语还是分析为结果状语或主语补足语？如果说是时间/地点状语，但是介词短语...

问题 drown用一般过去时与过去进行时的区别

The man drowned, but we managed to save him.书上说这里的 drowned 改为 was drowning。为什么要这样改？drown用一般过去时与过去进行时有什么区别？

问题 have been in是“一直在”还是“曾经在”

I won’t go to Chengdu this month as I ____ that city for a long time. 中为什么横线处要填have been in 呢？此时我已不再成都了呀！求 have been in 用法！

问题 spokesman,spokeswoman(发言人)后接什么介词

...he spokesman for the Democrats 民主党发言人 但是可以用 of 或 to 吗？

问题 stay at home cooking dinner如何分析句子成分

Sally and mother stayed at home  cooking dinner.这句话的 cooking dinner 做什么成分？要是换成 to cook dinner 呢？谢谢！

问题 英语句子的语法结构分析（一小段）

...有没有人能帮忙分析一下下面这个句子的语法结构。Prior to him, all that was known of electricity and magnetism was what the ancients knew, nothing more than that the lodestone possessed magnetic properties and that amber and jet, when rubbed, would attract bits of paper or other ...

问题 after后接动名词时是介词还是连词

老师您好，After removing a section of the mummy,they sent it to a laboratory.请问老师句中的 after 是介词还是连词？removing a section of the mummy 是否为现在分词做伴随状语？盼复！

问题 动词seat与sit的用法区别

...ere seen ______ on the benches, chatting happily.A. having seated  B. to seat   C.seating  D. seated答案为 D。B 不行，为什么？请顺便解释一下seat 的用法，以及与 sit 的区别，说 seat 是及物动词，它就得用 seated 的形式，太迷茫了。谢谢!

问题 分析一个词典定义句子的结构（涉及or并列成分）

柯林斯词典对 adequacy 的定义是这样的：Adequacy is the quality of being good enough or great enough in amount to be acceptable. 我看不明白这个句子的结构，尤其是看不清这里的 or 是将哪两个成分并列了。