Pay attention: what preposition needed?

[Take_It_Easy]

I pay attention to my study, or I pay attention my study

which one is correct, and why?

I'm confused, because there is a phrase for that when you want to hook up with a girl

- to pay attention to a girl or lady

Furthermore:

I have to pay more attention to my son, is it right sentence?

[Mister Micawber]

You need 'to'.
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Native English teacher at Mister Micawber's