"sing" 是一个英语动词，其各种时态如下：

一般现在时

第三人称单数形式：sings

复数形式：sings

例句：She sings very well.

一般过去时

过去式：sang

例句：We sang a song last night.

一般将来时

will sing

例句：He will sing a new song next week.

现在进行时

is/are singing

例句：She is singing a beautiful song.

过去进行时

was/were singing

例句：He was singing English songs when his sister came back.

现在完成时

have/has sung

例句：They have sung many songs together.

过去完成时

had sung

例句：By the time we arrived, they had already sung the national anthem.

现在将来时

will be singing

例句：This time next week, I will be singing at the concert.

过去将来时

would/should sing 或 was/were going to sing

例句：She said she would sing a song for us.

这些时态的用法和例句可以帮助你更好地理解和运用 "sing" 这个动词在不同时间和语境下的表达。