This/That/It is the first/second ··· time + that从句+现在完成时
This/That/It is the only ··· + that从句+现在完成时
This/That/It is the best/finest/most interesting···+that从句+现在完成时
3.在时间或条件状语从句中,现在完成时可以代替一般将来时。
I shall post the letter as soon as I have written it.
If you have done the experiment, you will realize the theory better. 时态
六、过去完成时考点分析(考核重点)
1.常用过去完成时的几种情况:
①在by, by the end, by the time, until, before, since后接表示过去某一时间的短语或过去发生的动作的从句。
By the end of last year, we had produced 20,000 cars.
The train had left before we reached the station.
②表示未曾实现的希望、打算、意图、诺言等。常用had hoped/planned/meant/intended/thought/wanted/expected等或用上述动词过去式接不定式的完成式表示, 即:hoped/planned···+ to have done。
③“时间名词 + before”在句中作状语,谓语动词用过去完成时;“时间名词 + ago”在句中作状语,谓语动词用一般过去式。
He said his first teacher had died at least 10 years before.
Xiao Hua left
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