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【拓展】
1. leave out还可意为"漏掉，遗漏"。如：
Decide with you partner which words have been left out.
2. 与leave相关的常用短语：leave behind遗留，留下
It left behind a long train of problems and difficulties.
leave over剩余，暂不解决
We shall have to leave the question over till the next meeting.
leave alone别管，不理会
If I were you， I’d leave this question alone.
【短语4】show off
【点拨】show off意为"炫耀"。如：
Those boys always show off their sports skills to the girls.
His brother likes to show off his knowledge in public.
【拓展】与show相关的常用短语：
show sb. around领某人参观
The headmaster showed us around the school.
show up出席，到场
The party is about to begin， but Mr. Wang hasn’t shown up.
热点语法聚焦
didn’t need to do和needn’t have done都有"过去不必做某事"的意思，但是didn’t need to表示"过去没有必要做某事，事实上也没做"；needn’t have done表示"过去本来不必做某事，实际上却做了"。如：
I didn’t need to take a taxi from the air-port —there was a bus all the way into the city.
I needn’t have booked in advance； there were plenty of tickets left.
此外，要注意need的其它用法：
need可作实义动词，也可作情态动词。
1. 作实义动词时， need有人称和数的变化，后可以接名词、代词、动词不定式和动名词等，否定式要在前面加don’t (doesn’t， didn’t)，疑问句用do (does， did) 提问。如：
The company needs some good salesmen.
His broken car needs to be repaired. = His broken car needs repairing.
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