一道完成时态的填空题

Tom has gone out. Tom_______. A. was out B. has been out C. is out D. will be out 我觉得应选 A 或 C，但填空题一般只选一个，肯定有一个是错的，不知如何选，请专家指导，谢谢！如题

play off against each other是什么意思

Elizabeth successfully played off against each other the two great Catholic powers，France and Spain. 这里的played off against each other理解不了。each other是什么成分修饰什么？如题

这个last week 是状语还是定语

请看下面这个句子，其中的 last week 是状语还是定语？Because of illness last week, I missed some lessons, but I will try to catch up with others. 如题

It goes without saying that从句

It goes without saying that if someone has lung problems they should not smoke.

ought to可以用作虚拟语气吗

If he started at six,he ought to be there now.没有用should ,而用了ought to,那此时还是虚拟语气吗?如题

so...that...中的so可以修饰动词吗

We have so arranged matters that one of us is always on duty.句子中的 so...that...用得有点奇怪，so...that...中的 so 应该修饰形容词和副词吧，这里的 so 怎么像是修饰动词呢？so...that...也可以这样用吗？如...

fall down, fall over, fall off, fall down from

请问fall down和fall over都是摔跤的意思吗？两个可以互换吗？

endow sb with 中 with..是双宾语还是方式

Nature endowed her with a beautiful singing voice.They are endowed with high artistic talents.endow是及物动词,为什么还要加with呢?是不是这里的with不是双宾语而是方式? 如题

如何区分“动词+副词”还是“动词+介词”

们好，我想知道如何看词组来区分“动词+副词”还是“动词+介词”，比如fit over the leg，把腿覆盖，这里我怎么判定over是副词而不是介词呢？

cause 后面只能加名词，不能加句子

Limiting children’s screen time can cause children maintain enthusiasm for studies.这个改错句子的错误原因是：cause 后面只能加名词，不能加句子，为什么呢？我不是很能理解cause后面为什么不能加句子？如题

对宾语从句的一个成分进行提问

各位，对宾语从句的一个成分进行提问，比如：你希望人们如何对待你，造句: How do you hope (that) thepeople treat you? 这里的 that 可加可不加嘛？

ever用在过去进行时是什么含义

If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.此处的ever该如何理解？ever用在过去进行时是什么含义？如题

不定代词somebody,anybody的纠葛

She lost herself in doing homework so that she didnt hear ____ knocking at the door at all.A. somebody B. nobody C. anybody D. everybody很多人选择C答案anybody，但是，我认为A答案somebody更合适，或...

插在句子中的短句作什么成分

关于单个的过去分词作后置定语

书上说，单个的过去分词作定语，总是放在被修饰名词的前面，但下面两个句子中，却用的是单个的过去分词作后置定语：Do you know the number of books ordered? 你知道订购了多少书吗? The experience gained will be...

什么叫附加状语

在一本语法书上看到，说下面句子中的Generally speaking是附加状语：Generally speaking, there are two ways to handle the problem. 一般说来，处理这个问题有两种方法。请问：什么叫附加状语？附加状语与其他状语...