(1)stop do means to stop what you are doing.

Example: Yes? Probably? Time? Where to? Stop? What are you doing? that ?

Maybe it's time to stop doing this.

(2)stop to do means to stop what you are doing and do another thing.

I was watching TV just now. When I heard my mother come into the room, I stopped to read.

I was watching TV just now. When I heard my mother approaching the room, I immediately stopped to do my homework.

2, the result of the action is different:

(1) The result of stopping is to stop.

(2) Stop doing new actions that have already started.

Extended data:

Similar examples are:

Stop doing something, stop doing something.

Hearing the doorbell ring, she stopped to open the door. Hearing the doorbell ring, she stopped opening the door.

Stop doing something, stop what you are doing, stop what you are doing.

Hearing the doorbell ring, she stopped washing dishes.

Forget to do sth.

Example: me? Never? Forget? Where to? Do what? Exercise. ?

I never forget to do sports.

Forget to do sth. (Having done something)

Example: Did? What about you? Never? Forget? Why? What about you? Is it? What are you doing? Something.

Have you ever forgotten why you did something?