n 一般过去时和过去完成时:这是中国学生学习的一个难点,因此也是考试的一个重点
过去完成时:发生在过去一个时间点之前的一个过去行为或状态,常用在:
1) 宾语从句(间接引语)中:He said (that) he had read the book several times.
2) 状语从句中(特别是时间状语从句):When we arrived at the cinema, the film had begun.
3) 由by引导的时间状语句中:He had completed all the college courses by 15 years of age. (15岁时,他已经完成了大学的所有课程。)
错:We had finished the task yesterday.
对:We finished the task yesterday. 或We had finished the task by yesterday.
要点:by 是过去完成时(和将来完成时)的标志词。
分清现在完成时、过去时、过去完成时的区别是英语时态学习的重点。
n 过去将来时:用来表述过去一个时间点以后的事情,其方向正好与过去完成时相反,如:
He said he would come to the meeting personally. (他说他将亲自出席会议。)
n 一般将来时和将来完成时:记住上面一句话: by 是将来完成时的标志词。
比较:
The world population will be over 6.5 billion in 2050.
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