2.about表示“大約”

　　at about 6:00 大約在六點鐘

　　about 100 meters 大約100米

　　3.與how/what連用，表示征求別人意見

　　how/what about + n/doing ? 去...怎么樣?/來個....怎么樣?

　　how/what about + sb ? 某人呢?

　　what about going for a walk? 去散步怎么樣?

　　how about a cup of coffee? 來唄咖啡怎么樣?

　　i like action movie.what about you? 我喜歡動作片。你呢?

　　4.be about to do sth 正要做某事，就要做某事

　　the train is about to leave. 火車就要開了。

　　when he came to my home,i was about to go out. 他來我家時，我正準備出去。