Grammar 1 and 2
同学们列举一下我们所接触到状语从句
状语从句
原因状语从句
结果状语从句
时间状语从句
地点状语从句
条件状语从句
让步状语从句
时间状语从句
1. 由when, whenever, as , while, after, before, until, till, since, once, as soon as, 等引导时间状语从句。1> When the bell rang, the guard was   waiting in his seat. 2> While ants grow they change their forms   three times. 3> Three months went by before Aqiao   knew it.