书上都说that引导名词性从句时没有任何含义，但是在下面这句中that表示“是否”的意思：He looked in the glass to check that his tie was straight. 他对着镜子看领带是否系正。请问：这个that用得对吗？这个that可以换成if或whether吗？
...老师had planned/ hoped/ wanted/intented/meanted that结构中， 宾语从句是否只能是 sb should do? 只能表示对过去的虚拟？2.从句的虚拟时态不受主句时态的影响吧？3.had thought that 与thought that接虚拟语气的规则是什么呢？4. 在believe,expect,think等...
Sharing economy provides us more convenient and enriches our life, in that it takes our less money to enjoy a variety of services that we are unaffordable before. 第一个in that 是因为的意思前面加逗号嘛
第二个that 引导的定于从句，错在哪里，怎么修改?
So, inventors deserve a reward forthe amount of time they spend developing their ideas.They also need the security of knowing that if they share the invention with the rest of the world, nobody will steal it....这两句话中，for 和 If 是引导的状语从句吗？
这类从句的时态只与主句与从句的先后有关系，而与主句的时态没有关系吗He looks as if he were ill.He looked as if he were ill.He looks as if he had been ill.He looked as if he had been ill.这四句是不是都对从句的虚拟语气形式不是绝对的过去、现在...
...为什么是前面it的同位语，what 可以换成 which引导非限定从句吗？另外，define后面的them指girls还是指前面的children？如果指girls怎么理解呢？ It was not until the mid-1980s,
when amplifying age and sex differences became a dominant children’s marketing
s...
...单项选择百题分类训练(中考真题+名校最新模拟题)专题01 定语从句100题》这份资料中，由这样一道题目：24. （2021·辽宁营口·中考真题）I’ll never forget
the place ________ we visited together last year.
A. which B. what C. who
D. Whom
...