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1some students ran back to the dormitory,magazines [held] un

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1some students ran back to the dormitory,magazines [held] under their arms .2the 29th Olympic Game
1some students ran back to the dormitory,magazines [held] under their arms .
2the 29th Olympic Game,[held]in Beijing in 2008 was a great success.为什么不用whicl held
3 in England ,tea [is served] with milk and sugar.第一题和第三题 比较 为什么第一题不用 are held?
1.some students ran back to the dormitory已经是一个完整的结构,主谓宾都有了,后面是逗号,说明后面的成分也是这个句子的一部分,在没有连词的情况下,一个句子不能有两个谓语,所以不能用are held.省略了are是因为后面是一个状语,表示这些学生是胳膊下夹着杂志跑回宿舍的.
2.前面的the 29th Olimpic Game 只是一个名词短语.如果后面加了which那么你就把后面当成一个从句,那么从句的谓语在哪呢?所以不能加WHICH,直接就是hold的过去时做定语.那么一整个句子的完整结构就是the 29th Olympic Game(主语),held(定语)in Beijing(地点状语) in 2008(时间状语) was(谓语)a great success(表语).如果你一定要用which,那么就要把从句补充完整,就应该是:the 29th Olpympic Game,which is held in Beijing in 2008 was a great success.
3.这个句子结构很简单.主语有了,但是没有谓语,所以直接补充个谓语就可以了,因为茶是被人们用来招待的,所以用被动态.