i know that he is a canadian athlete.为什么要用that呢?

英语翻译I know that he is a man who (that) means what he says. i know that he is a canadian athlete.为什么要用that呢? 高中定语从句I know that he is a man that means what he says这里THAT是什么作用呢?我觉得没有THAT也句子啊 不明 he know that that that that that man is a policeman 结构（没口吃） 10.I know nothing about him （ ）he is a teacher.A.besidesB.in additionC.except forD.except that All I know is that life is a struggle是什么意思 I want to know __ he is tall.A.that B.if C.how D./ 翻译并语法说明 哪位英语达人知道帮个忙啊~Draw a tree diagram of the sentence “I know that he is from China”要“I know that he is from China”这句话的树状图， I know where that is 新概念英语第一册99课和100课that的详细用法2 She thinks that she's got a cold.3 I know that I need an X-ray.4 We know that he can swim well.5 They believe that she is ill.6 I am sure that he will sell his house.7 I am sure that she is a I ___(know) him since he ___(is)a child I ( )(not know )he is a good student. I don't know his job.he is a doctor I don't know his job.he is a doctor Excuse me. Where is the zoo? -Sorry, I don’t know. Ask that policeman. He _____ know.A. shall B. may C. need D. would为什么是B - Excuse me.Where is the zoo?-Sorry,I don’t know.Ask that policeman.He _____ know.A.shall B.may C.need D.would为什么？ I know that our future is not just a dream?I know that our future is not just a dream! 请问 I know the fact that he is right 是请问 I know the fact that he is right 是同位语从句还是定语从句?