Simone
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since +过去的时间,用于现在完成时，所以since last year是现在完成时；
现在完成时( The Present Perfect Tense)是过去的动作或状态持续到现在，对现在造成的影响，可能持续发生下去。在英语时态中，“时”指动作发生的时间，“态”指动作的样子和状态。
扩展资料
The hotel has polished up its act since last year.
这家酒店自去年以来已经改善了服务水平。
Our problems have multiplied since last year.
自去年以来，我们的问题成倍增加。
Violent crime has increased by 10 percent since last year
暴力犯罪自去年以来增加了10%。
The manufacturing industry has contracted by 1.5% since last year.
自去年起，制造业已经萎缩了1.5%。
He hasn't been home since last year.
自从去年至今他未回过家。
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