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问题 than 后接if从句的用法疑问

请问 than 后面可能接 if 引导的从句吗？比如：If we eat out too often, the cost of living will be much higher than if we eat at home.我总觉得句子中的 than if 用得有点怪。请问这样的 than if 用得对吗？请教各位专家老师！

问题 as从句作定语的分析

The first of these shelters, or youth hotels, as they are now called, was set up in 1910.请分析下as的用法, 知道是做定语，但不清楚是哪一部部分？

问题 a ... of 的用法

...of his 请问a friend of him的结构存不存在呢？为什么我们只能用a friend of his 呢？谢谢！

问题 宾语从句引导词问题

Gross MarginGross margin is the percentage difference between what a product sells for in the market and what it costs to produce that product.what it costs为什么不写成how much it costs?

问题 to do 定语 状语

When she posted a video, to show her approval to the idea, the mass thought it was an approach to distract their attention.请问这两个动词不定式前一个是状语后一个是定语吗？为什么？第二个it是形式主语还是代词呢，请问如何区分呢？

问题 lose one's heart 可以有复数吗（lose one's hearts）

我知道 lose heart 与 lose one's heart 的区别，但不太清楚 lose one's heart 能否用复数，我指的是当主语是复数时，heart 能不能用复数。如：We mustn't lose our heart at any time.We mustn't lose our hearts at any time.

问题 请问过去将来时怎么理解？

...，是否有语病呢？时态上？如果现在时间是周四，当然就只能用would了，He said he would finish homework wendseday.请问这句话是否暗含他并没有在周三完成作业的意思呢？我最搞不清楚的是，这个例句用不用过去将来时，与说这句话的时...

问题 是否是定语从句的判断

Anything he did I, natually, copied.  he did 是定从吗？naturally为什么两边有逗号？

问题 postpone 的时态问题以及宾语从句时态问题

... coronavirus outbreak, the ministry of education said.1. 这句话是宾语从句吗？因为主句放在最后在。2. 如果不是宾语从句，那这个地方的答案应该是什么呢？3. 这个postpone 是瞬间性动词还是延续性动词？我感觉这个单词的汉语意思不太好理...

问题 when doing sth是什么用法

... take quite a while。but when…应是做副词修饰作用的一个状语从句，但从句中为何不使用动词原形deal with，而使用分词形式呢？

问题 “by the time+过去时间”为何不用过去完成时

有人说，“by the time+过去时间”句子要用过去完成时。如： By the time I got home, she had already gone to bed. 我到家时她已睡觉了。 By the time he got there, everyone else had arrived. 他到达那里时，别人已都到了。 The rain had set in stea...

问题 turned their focus to public education中的to public education是宾补还是方向状语

...。请问as a matter of national security是 public education 的后置定语吗？one是引导非限定性定语从句，并且指代前面一句话吗？ turned their focus to public education中的to public education是宾补还是方向状语？

问题 现在分词被动式作定语时转化为定语从句的进态

The question being discussed was presented by the headmaster. 这句话等于The question which is being discussed was presented by the headmaster.还是The question which was being discussed was presented by the headmaster. 

问题 to that intended的语法分析（过去分词作定语修饰that）

...e deficit with the US.老师分析说：intended是过去分词作 that 的定语。that intended 翻译为“想要的效果”，或直接翻译为“初衷”。我的疑问是：过去分词可以作定语修饰 that 吗？我是第一次见这样的用法，请老师补充分析一下。 相...

问题 主将从现中的从句时态为什么有时会使用现在进行时

老师，您好！ 主将从现中，从句的时态，一般要使用一般现在时，然而，为什么有些从句中会使用现在进行时呢？例如：If it's raining tomorrow, the sports can take place indoors.（为什么不说If it rains tomorrow? 二者有何区别？） I...