sing的过去式和过去分式

Do sing along if you know the words.

要是知道歌词，你就跟着唱吧。

I'll sing if I want to ─ there's no law against it.

我想唱就唱——谁也管不着。

There is some similarity in the way they sing.

他们的演唱风格有点像。

I can't sing that high.

我唱不了那么高的调子。

He doesn't sing all that well.

他唱得并不特别好。