高一北师大版学案系列27
[名师讲堂 ] 重点短语
【短语1】watch out
【课文原句】They have a huge mouth and can eat fish as big as themselves. Watch out! (Page12)
【名师点拨】watch out在这里的意思是"当心；注意",相当于look out或be careful。如:
You’ll catch cold if you don’t watch out.
【知识拓展】watch out 后接名词时,要与for连用,意为"小心……"。如:
In public places everyone is required to watch out for thieves.
I’m always watching out for mistakes that I may have missed before.
【短语2】all at once
【课文原句】All at once, the sky was covered with dark clouds and in less than a minute we were in a terrible storm. (Page14)
【名师点拨】all at once 是副词短语,相当于suddenly,意为"突然"。如:
All at once she lost her temper, which made all the people present dumbfounded(目瞪口呆).
【知识拓展】all of a sudden与all at once都是副词短语,都有"突然"的意思,但all of a sudden更强调"出乎意料地",即unexpectedly。如:
All of a sudden, the tyre burst; we had to stop on half way, considering what to do.
all at once还有"同时,一下子,马上"的意思。如:
On hearing the news of his illness, he drove to see him all at once.
【短语3】pick up
【课文原句】In the end, a boat picked me up. (Page15)
【名师点拨】pick常作及物动词,意思是"选择；挑选；采；摘"。在本句中pick sb. up是一个固定词组,意思是"(从海里或危险处)营救,搭救"。如:
She picked the best cake for herself.
We picked up as many people from the burning ship as we could.
【知识拓展】
1. pick up还有其他意思:1) (开车)接人；2) 让人乘车；搭载；3) 学得:通过学习或经历获得(知识)。
2. pick还能与其他介词搭配构成固定短语,如:pick on sb. / sth.(跟某人)找别扭；故意刁难挑剔；pick sb. / sth. out精心挑选；辨认出；pick sth. over用心挑选；筛选。



















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