forget / remember

with regard to the future

Remember to switch off the lights.

with regard to the past

Do you remember switching off the lights?

go on

start something new

Go on to read.

continue with the same action

Go on reading.

regret

with regard to the future

I regret to say that.

with regard to the past

I regret saying that.

stop

interrupt another action

I stopped to smoke.

terminate

I stopped smoking.

try

do something complicated

Try to solve this riddle.

do it and see what happens

Try talking to him.