This/It is the first/second time＋that从句,that从句谓语为什么要用现在完成时

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• This/It is the first/second time＋that从句,that从句谓语为什么要用现在完成时
• 英语语法宾语从句问题.老师说,宾语从句前面的谓语如果是什么rely on ,depend on如果加宾语从句,一般要加it.请问这个是什么语法现象O O为什么要加it?是不是只有that引导的时候才加,如果换成what等引导的宾语从句是不是就不用it了.谢谢!~求例句.~请不要复制.简洁的语言告诉我吧..谢谢!是不是因为that这个词只有在expect,but,besides,in这几个介词后面直接引导宾语从句,而对于其他介词如果要用that引导宾语从句就要加it?it在这里是个什么成分.谢谢!
• This is the first time (that) I've heard him sing.这是我第一次听他唱歌.为什么从句要用完成时?
• the stated number is less than zero or that the second number is to be taken away from the first.or后面为什么还要来一个主语从句呢?另外OR 后面的句子怎么翻译呢?
• 几道初三英语题（欢迎回答）1、My friend asked me,"Do you help your parents with the housework on weekdays?"（改写句子,句意不变）My friend asked me ------- I --------- my parents with the housework on weekdays.2、乘电梯到四楼是用take吗?怎么翻译?3、Tom hasn'treturned the book I -------- to him.(lend)这里要用过去式吗,为什么?4、以I think……的陈述句,小问句的谓语以宾语从句,主语也是以宾语从句决定吗?
• I will not believe you unless I have seen it with my own eyes.此句中的从句为什么要用现在完成时
• 请问这里为什么要用ing形式呢?翻译：听你们这么说我感到很不舒服我们的正确答案是：I feel very uncomfortable when hearing what you said.其中,hear为什么要加ing呢?是不是伴随状语啊?可不可以换成I feel very uncomfortable when I heard you say that.是不是状语从句中省略了主从句中相同的主语以后,再看主语和谓语的关系?如果是主动，就用ing形式，如果是被动，就用动词的过去形式（heard）?
• 请问second conditional句型条件从句为什么要用过去式?
• 虚拟语气if 大多数的虚拟条件句属于上面三种情况的一种,但并不排除存在条件和后果中,一个和现在情况相反,另一个和过去情况相反,例如：If you had followed what the doctor said,you would not have been so painful now例句该怎么详细分析 我觉得主从句都是过去时的虚拟语气啊?虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过去式(be 一般用were)，主句用would/ should/ could/ might +动词原形you would not have been so painful now 是对现在的虚拟 那为什么要用have been 不应用be吗
• She could tell at first glance to...She could tell at first glance to which class a man beloned.这句话中的那个to让我感到费解,为什么要用to呢,这是个什么从句?
• therw was a time when后的从句是否要跟完成时
• 已知函数f(x)=2sin2xcos2x+(cos2x)^2-(sin2x)^2 求函数f(x)的最小正周期