1.形容词.从那时以来；以后：ever since(从那时起）以前：long since(很久很久以前） 2.介词.自……以后；自从：since then(从那以后） 3.连词.自……以后；从……以来：How long is it since you were in London?(你在伦敦有多久了?） 既然,因为：Since we have no money,we can't buy it .因为我们没有钱,我们不能买它.
since的几种用法及区别
1.形容词.从那时以来；以后：ever since(从那时起）以前：long since(很久很久以前） 2.介词.自……以后；自从：since then(从那以后） 3.连词.自……以后；从……以来：How long is it since you were in London?(你在伦敦有多久了?） 既然,因为：Since we have no money,we can't buy it .因为我们没有钱,我们不能买它.