since的句型
问题描述：
since的句型
答
1.Since we have no money , we cannot buy a car. Since 还可译为"因为"
2. 主句（现在完成时）+.since+时间点(过去时间)；.
3. 主句（现在完成时）+. since+时间段+ago；.
4. 主句（现在完成时）+. since+句子(一般过去时)
答
怎么了
答
1.since+时间点；如,He has been in China since 2000.2.since+时间段+ago；如,Mr.Brown lived here since ten years ago.3.since+句子；如,Alice has been skating since she was nine years old.