keep it clean.
• * in case(万一) • Send us a message in case you have any
difficulty.
• *on condition that(?) • We’ll let you use the room on condition
that you keep it tidy.
• for 解释说明 • He must be ill, _______.(因为他今天没来)
三 条件状语从句 conditional adverbial clause
if,unless,so/as long as, in case on condition that, provided that,providing that,suppose that, supposing that
if If you work harder,you will succeed.
unless :if... not 除非 • Unless he comes, we won’t be able to go. • If he doesn’t come,we won’t be able to go.
• * as/so long as(只要 ) • You may borrow the book as long as you
2. while“尽管,虽然”,相当于although
3. while意为“而,却”,表示对比。 Jane was dressed in brown while Mary was dressed in blue.
as的用法
1. “一边…一边”; “随着” She was doing her homework as she was listening to the music.