Gerund vs Infinitive

remember + gerund

I remember sending the email. (I recall the past action.)

remember + infinitive

Remember to send the email. (Don't forget to do it in the future.)

forget + gerund

I'll never forget meeting the CEO. (memorable past event)

forget + infinitive

She forgot to attach the file. (failed to do something)

stop + gerund

He stopped smoking. (discontinued the activity)

stop + infinitive

She stopped to read the notice. (paused in order to do something)

try + gerund

Try using a different approach. (experiment — see if it works)

try + infinitive

She tried to open the file. (made an effort / attempt)

regret + gerund

I regret signing that contract. (feel sorry about a past action)

regret + infinitive

I regret to inform you... (formal announcement of bad news)