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新一轮中考复习备考周期正式开始， 从属连词用法： 从结构上说，英语连接词分两大类：并列连词和从属连词。 并列连词连接两个或两个以上地位平等的字、词组或分句。例如： (1) Air and water are indispensable to me. (2) She likes going out with friends or playing outdoor games. (3) Most workers have a good income, so they look very happy. 从属连词连接两个或两个以上的分句，形成复杂句中的从属分句。例如： (4) He said that he did not want to go . (5) Many things have happened since I last saw him. (6) You may come if you want to. 从属连词用来连接各种从句。 until(till)直到，在用until表达时间状语的句子中，主句中的动词是要十分小心去选择的。 如动词是持续行动词，它要用肯定句，如： I studied hard until 12 o'clock last night. 如果动词是瞬间截止性动词，则要用否定句，如: He didn't go to bed until his mother came back. 由since,for,by,before, 来引导的时间状语从句。 since 引导的时间状语是动作的开始时间，如: I have studied English since 1990. 而by引导的时间状语通常是动作的结束时间，如： I had learned 25 English songs by the end of last term. (责任编辑：admin) |