(1)It is(has been)+一段时间+since从句 This(That/It)is the first(second...)time that+现在完成时 This is the first time we have seen a film in the cinema together as a family. 这是我们全家第一次到电影院看电影。 (2)在条件、时间、让步状语从句中,表示将来某时以前已完成的动作。 —When shall we restart our business? —Not until we have finished our plan. ——什么时候我们重新开始我们的事业? ——直到我们已完成我们的计划。
2.下列情况下常用现在完成时。
过去完成时 1.过去完成时是一个相对的时态,考生做题时关键看该动作是否发生在题干中所给的过去的动作或过去的时间之前,如果是就用过去完成时,如果不是就用一般过去时。
Last month, the Japanese government expressed their thanks for the aid they had received from China.
上个月,日本政府对从中国得到的援助表示感谢。
2.by, by the end of, by the time, until, before, since后接表示过去某一时间的短语或从句,主句用过去完成时。
I had learnt 5,000 words before I entered the university.在我上大学前就学了5 000个单词。 3.表示“一……就……”的几个固定句型:Hardly/No sooner/Scarcely had+主语+过去分词+when/than/before+从句(一般过去时)。
Hardly(No sooner)had I got home when(than)the rain poured down.
我刚到家大雨就倾盆而下。
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