来源：学生作业帮 编辑：搜搜考试网作业帮 分类：英语作业 时间：2024/06/04 20:04:52
for和since的用法有什么不同
都用于现在完成时,但具体怎么分
很简单.
since+时间点/ 句子,for+时间段
1 I have been here for about 10 years.
2 I have been here since 10 years ago
3 I have been here since I was 10 years old.
4 I have been here since 2001
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