What is the difference between ‘pay attention to something’ ,‘focus on something’ and concentrate on something'?

2017-09-08 04:55:04

What is the difference between those phrasal verbs?

1,pay attention to: to listen to, watch, or consider something or someone very carefully

2,concentrate on :to give all your attention to the thing you are doing

3,focus on: to concentrate on something and pay particular attention to it

4,keep one's mind on: to concentrate on someone or something.

I have checked the meaning of them, I think they are the same and can be used interchangeably when referring to give your attention to something.

the only difference is that ‘pay attention to’ is a little weaker in this meaning. Is that right?