BEForE后面 时态

I thought I had sent the letter a week before.我认为我一星期前就把信寄出去了。(6)状语从句:在过去不同时间发生的两个动作中,发生在前,用过去完成时;发生在后,用一般过去时。 如:when,before,after,as soon as,till

4)在动词hope,take care that,make sure that等后。I hope they have a nice time next week:我希望他们下星期玩得愉快 Make sure that the windows are closed before you leave the room:在离开房间前要确保窗子都关闭 用

时态问题 时间状语从句常用的连词有:when,as,while,before,after,since,till,until,as soon as,once。【例】Before I could get in a word, he had already given orders.我还来不及插话,他已经吩咐下去了。After the

since+时间点=for+时间段since+一般过去时态的时间状语从句=since+时间段+ago since+一般过去时态的时间状语从句。例如:He has been here since he joined the army。自从他参军以来,他一直在这儿。before 表示之前发生的事情,放在句

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