payattentionto后加什么？payattentiontodoingsthpayattentiontosth.因

pay attention to doing sth
pay attention to sth.
因为to在这里做介词用.
e.g
1.pay attention to state affairs
关心国家大事
3.Please pay attention to taking care of your baby.
请注意照顾好你的小孩.

to是介词,所以后面接名词以及动名词.
pay attention to sth. / doing sth.

这里的to是介词+doing