他是否来无关紧要。
③ The twins are so alike,it’s difficult to tell the difference.
这对双胞胎长得太像了,很难分出谁是谁。
【重点句型】
Remove clothing using scissors if necessary unless it is stuck to the burn.除非衣服粘贴在烧伤面上,否则就把它脱掉。必要时可用剪刀帮助。
if necessary 是状语从句的省略
① If it is necessary ,we shall go home at once.
如有必要,我们应立刻回家。
② While (you are) cycling,don’t forget the traffic lights.
骑车时,不要忘记看红绿灯。
③ Whenever (it is) possible,he will come to my help.
他一有可能就来帮助我。
2. John was studying in his room when he heard screaming.
约翰正在房间里学习,突然听到一声尖叫。
此句型中when作并列连词相当于and then意为”正当……时突然”
【归纳拓展】when并列连词,= and then,表示“就在那时,突然”,常见以下句型中:
(1) be doing...when...正在做……突然……I was wandering through the streets when l caught sight of a tailor's shop.
(2) had done...when...刚做了……突然……I had just sat down when the light went out.
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