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【拓展】
1. leave out還可意為"漏掉，遺漏"。如：
Decide with you partner which words have been left out.
2. 與leave相關(guān)的常用短語：leave behind遺留，留下
It left behind a long train of problems and difficulties.
leave over剩余，暫不解決
We shall have to leave the question over till the next meeting.
leave alone別管，不理會
If I were you， I’d leave this question alone.
【短語4】show off
【點撥】show off意為"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】與show相關(guān)的常用短語：
show sb. around領(lǐng)某人參觀
The headmaster showed us around the school.
show up出席，到場
The party is about to begin， but Mr. Wang hasn’t shown up.
熱點語法聚焦
didn’t need to do和needn’t have done都有"過去不必做某事"的意思，但是didn’t need to表示"過去沒有必要做某事，事實上也沒做"；needn’t have done表示"過去本來不必做某事，實際上卻做了"。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可作實義動詞，也可作情態(tài)動詞。
1. 作實義動詞時， need有人稱和數(shù)的變化，后可以接名詞、代詞、動詞不定式和動名詞等，否定式要在前面加don’t (doesn’t， didn’t)，疑問句用do (does， did) 提問。如：
The company needs some good salesmen.
His broken car needs to be repaired. = His broken car needs repairing.
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