1.句子主干是“我们走回家”，因为车没有来所以我们只好走回家，可以使用so连接两个句子，表示因果。据句意使用过去完成时，表过去的过去
译:Half an hour had gone by，but the last bus had not come yet so we had to walk home.
2.句子主干是“玛丽对汉语考试很担心”，是因果关系用because连接，时态为一般现在时，看上去-look，背熟课文-learn the text by heart
译:Mary looks very worried about the Chinese exam because she has not learned the text by heart.
3.句子主干是“我们去参观博物馆”，since既然，此处为推论因果复句。主句用一般现在时，已被-现在完成时。不妨-might as well
译:Since the basketball match has been postponed ，we might as well visit the museum.
4.句子主干是“他住在澳大利亚”，all the way一直 放在动词之后
将时间状语放在句尾
译:He lived all the way in Australia with his parents during entire world war II period .
5.句子主干是“我与我的同学失去了联系”，since引导时间状语从句，主句用现在完成时，从句用一般过去时，失去联系-lose touch 可以说-kind of
译:Since I graduated from Nanjing university in 1985，I have kind of lost touch with my classmates.
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