2017年12月四級(jí)考試已經(jīng)離我們不遠(yuǎn)了，為了讓同學(xué)們更好準(zhǔn)備四級(jí)考試，特別整理了《2017年12月英語四級(jí)重點(diǎn)語法知識(shí)：條件狀語從句》，希望可以為大家?guī)韼椭? 預(yù)祝大家高分通過考試。
條件狀語從句
連接詞主要有 if, unless, as/so long as, on condition that 等。.
if 引導(dǎo)的條件句有真實(shí)條件句和非真實(shí)條件句兩種。非真實(shí)條件句已在虛擬語氣中闡述。
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied, let's go out for a walk.
典型例題
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A。 句意：除非你立即走，否則你就回遲到的?？赊D(zhuǎn)化為 If you dong leave immediately, you will be late. B、D句意不對(duì)，or表轉(zhuǎn)折，句子如為 You leave immediately or you will be late.
條件狀語從句
連接詞主要有 if, unless, as/so long as, on condition that 等。.
if 引導(dǎo)的條件句有真實(shí)條件句和非真實(shí)條件句兩種。非真實(shí)條件句已在虛擬語氣中闡述。
unless = if not.
Let's go out for a walk unless you are too tired.
If you are not too tied, let's go out for a walk.
典型例題
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A。 句意：除非你立即走，否則你就回遲到的?？赊D(zhuǎn)化為 If you dong leave immediately, you will be late. B、D句意不對(duì)，or表轉(zhuǎn)折，句子如為 You leave immediately or you will be late.