【急】英语语法题!When eleven o' clock came and he still hadn'

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【急】英语语法题!
When eleven o' clock came and he still hadn't arrived,I began to wonder if he had had an accident.这句话为什么是对的?
I really miss the time___we spent together in middle school.这句话中的空格为什么不能填“when”?
The accident was happened when I was trying to find a place to park.这句话错在哪里?
My brother has joined the Youth League for years.这句话哪里错了?

第一句,你是想问,if he had had an accident为什么是对的吗?第一个had,是过去完成时的助动词,第二个had是动词,表示的意思“有”.过去完成式一般形式中had done中的done 在这个句子中是第二个had.
第二个句子,答案为 that ,which或不填.we spent together in middle school中,spent 缺少宾语,句子不完整.所以必须用关系代词that 或which.如果要用关系副词when 的话.后面的句子一定要完整,就是不缺主语,宾语,等.
第三句,应该是The accident happened.happen 不能用被动.
第四句.由于后面有一段时间for years ,join不是延续动词.所以不对.
If you have any questions ,you can ask me .I will answer your questions as soon as possible.I can definitely help you with your English.

【急】英语语法题!When eleven o' clock came and he still hadn' when he came back from work ,it was ten o’clock.同义句 He _____ It was 7 o'clock when he came here yesterday. 是定语从句吗? It was at two o'clock p.m.when he came back.哪里错了? 3.When he came back at five o,clock,there were___many bright 1：It was 6 o'clock -------he came home A.that B.what C.when yesterday about eleven o'clock he （）towards the park. 求解一道英语语法题Realizing that he hadn't enough money and ____to bo he was still smiling when the door opened and his wife came eleven o' clock怎么读 lt' s eleven o'clock. In New York i\'s still eleven o\' clock in the morning是什么意思