发音: /sæŋ/，/sʌŋ/
sang:
v. 唱，唱歌（sing的过去式）She sang on the backing track.
她是唱和声的。
The choir sang with precision.
合唱团的演唱准确无误。
We sang songs to pass the time.
我们借唱歌消磨时间。
The birds sang， the bees hummed.
鸟儿唱歌，蜜蜂蜂鸣。
As he sang， he strummed his guitar.
他边唱边拨着吉他。
sung:
v. 唱歌（sing的过去分词）I have already sung this song.
我已唱过这首歌了。
I have sung the song already.
我已经唱过了这首歌了。
She's never sung like that before.
她以前没有这么演唱过。
Have you ever sung that English song?
你曾唱过这首英语老歌吗
