10、重点难点精讲（九） ...
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一、during the past three years是什么时态标志
during the past/last three years 意为“在过去的3年中，近3年来”，也可说成in the past/ last three years。这个短语指的是到现在为止3年来的状况，是现在完成时的时间标志。
I have been there several times during the past three years . 在过去的3年中我到过那里数次。
During the past month she has read three English books. 她在过去的1个月中读了3本英语书。
He has written three letters to her in the last few weeks . 在过去的几个星期里，他给她写了3封信。
二、for能否表示目的
for 引导一个短语，常用来表示目的，相当于一个不定式短语。
He is getting ready for the party. 他正在为参加聚会做准备。（=He is getting ready to attend the party. ）
She has gone to the south for a holiday. 她去南方度假了。（=She has gone to the south to have a holiday. ）
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第10章 重点难点精讲（九）
