问题 must表推测不能用于否定句中吗？

...s must not receive any message about her. They don't know what has happenedto her. A. must not have received B. ought not to receive C. not ought to have received D. not ought to receive A [译文]她的父母一定没有收到任何关于她的消息，他们不知道她出了什...

问题 求问I am happy living alone和I am happy to live alone的区别

老师好！请帮忙分析以下两句的语法成分以及区别：1-I am happy to live alone.2-I am happy living alone.谢谢解答~

话题 so far/up to now/thus far/as yet之间的区别

话题 不定式在句子who are you to take us down的用法

话题 to include all critical materials不定式在被动语态中做什么成分

话题 as 的用法（涉及as adj as it is to do sth）

问题 no more difficult=not more difficult吗

在资料上看到这样一句：Selling goods abroad is no more difficult (=not more difficult) than selling to the home market. 做外销并不比做内销难。能说 no more difficult=not more difficult吗? 这样一来那不是 no = not 了？

问题 动名词的完成式与一般式用法疑问

Now he regrets not having gone to university . … Mr. Smith regretted blaming his secretary for the mistake, for he later discovered it was his own fault. 按道理说都是在谓语动词之前发生的事啊？也什么不都用having done或者都用doing?

问题 on a checkout line搭配不太规范吧

HOW WILL you know if the person next to you on a bus, aeroplane or checkout line is infectious with covid-19? checkout line前用at才符合习惯吧。谢谢各位大咖专家老师！

问题 单个过会分词作前置定语表完成

Another block to awareness is the obsession many of us have with naming things. 译文：另一个阻碍意识的障碍是我们许多人对已命名的事物的痴迷。 问：这里表示“已命名的”，表示动作已经完成，可以用named 这个形容词吗？name是“命名"意思...

问题 冠词的用法

A Mr. Hsu was in the suite of a vice-minister.请问老师为什么要用不定冠词A？

问题 because 可以引导主语从句吗

请问这个句子有没有错误？句子的主语是什么？Just because he likes working out on early morning does not mean he's never gone for a swim at night.

问题 know的词性判断

Americans know a lot about their troubles.这里的know有两种用法，a lot也有两种语法，请问如何判断know的词性?

问题 than比较分句

请问老师，Their clothes seemed dirtier than when she had last seen them. 1. than引导的比较分句可以分为哪几个类型？ 2. 后面的when是作什么成分呢？

问题 I hate to sound so negative here的分析与理解

这里的sound是表示听起来的意思吗？能否请老师们分析一下这句话的成分呢？