是必须加逗号?还是可以加可以不加?什么时候不能加?
I would love to go, but I just can't.
有不可以加逗号的情况么?
一般连词如果在句首,基本上习惯用逗号,如果在后面可以不用
比如After he came back,he went to see her again.He went to see her again after he came back.
但有一些特殊的并列连词,有可能不需要,比如So he did.