since (EN)

介词，副词，连词

介词 “since”

1. 自从
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   She has been living in New York since 2010.

副词 “since”

1. 从那时起
   She moved to Spain in 2010 and has lived there ever since.

连词 “since”

1. 自从（用作从句引导词，表示动作或情况开始的时间）
   She has been my best friend since we were in kindergarten.
2. 既然（用作从句引导词，表示原因或解释）
   Since it's raining, we'll have to cancel the picnic.