The moment I entered the room, I smelled something unusual.

　　Every time I visit him, he is always reading.

　　3．directly和immediately也可作为连词，引导时间状语从句，意为“一……就……”，相当于the moment/the instant和as soon as。如： I knew something was wrong directly I arrived.

　　The boys did all sorts of mischief immediately my back was turned. 4．before 和after before 引导的从句的动作通常发生在主句动作之后，如果从句是过去时，主句一般要用过去完成时或一般过去时。after引导的从句动作通常发生在主句动作之前，如果主句要用过去时，从句则要用过去完成时或一般过去时。例如： The plane had taken off before he arrived at the airport.

　　After he had lived in the south for nearly 20 years, he decided to go to seek his fortune in the north.

　　They arrived at the cinema after the film began.

　　5．no sooner...than 和hardly (scarcely)．.. when 这两个连词词组都是表示主句与从句动作随即发生，意为“一……就……”。主句动词用过去完成时。如果no sooner, hardly 或scarcely位于句首，主句要倒装。例如： No sooner had he entered the house than it began to rain.

　　He had hardly gone to bed when the telephone rang.

　　6．till 和until 这两个词的用法十分近似，都表示“直到……”，但在句首只能用until。在肯定句中，主句要用延续性动词；在否定句中，主句要用非延续性动词，这时until和before同义。例如： They did not go home until they had finished the work.

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