正确的是pay attention to后加doing。to后之所以加doing，而不是加do，这是因为这一短语中的to是介词，介词后面要加名词、代词或者动名词，所以是pay attention to doing，意思是“注意做某事”。

   pay attention to后加doing，因为to在这里做介词，意思是注意做某事。例如，I have to pay attention to doing my homework。

    pay attention to后加什么

    pay attention to doing sth

    pay attention to sth.

    因为to在这里做介词用.

    e.g.pay attention to state affairs.

    关心国家大事.

    Please pay attention to taking care of your baby.

    请注意照顾好你的小孩.

    pay attention例句

    In doing our work, we must pay attention to ways and means.

    做工作应注意方式方法。

    I don`s pay attention to such gossip.

    我才不理那些闲话呢。

    Pay attention to traffic regulations.

    注意交通规则。

    Pay attention to your spelling.

    请注意拼写。

    Don`s just keep slogging away. Pay attention to method.

    别一个劲儿傻干，要讲究方法。