adv. From a definite past time until now; as, he went a month
ago, and I have not seen him since.
adv. In the time past, counting backward from the present;
before this or now; ago.
adv. When or that.
prep. From the time of; in or during the time subsequent to;
subsequently to; after; -- usually with a past event or time for the
object.
conj. Seeing that; because; considering; -- formerly followed
by that.
prep. 自...以后, 自...以来
adv. 自那时以后
conj. 既然, 自...以后, 自...以来
1. I have lived here since 2010.
我自2010年以来一直住在这里。
2. She has been studying English since last year.
她自去年以来一直在学习英语。
3. Since it was raining, we stayed indoors.
由于下雨，我们呆在室内。