since，then創立造句

since then的意思是從那時起，例如Exactly four years have passed since then.從那時起，整整4年過去了。

It was the first in the e then，about one hundred nations have followed that example.這是世界上第一次。從那時起，大約有100個國家效仿了這個例子。

Ever since then I've been longing to meet him .從那以後我一直渴望見到他。

She's teach English since then.

從那時起她就教英語。