64 Remember, regret, try, etc With some verbs, the choice of a to-infinitive or an ing-form depends on the meaning A Remember and forget / must remember to post this letter today. It's important. The clothes are still dirty because I forgot to switch on the machine. We use remember/forget to do for necessary actions. The remembering is before the action. I can remember posting the letter. I posted it on Friday morning. I'll never forget flying over the Grand Canyon. It was wonderful. We use remember/forget doing for memories of the past. The action is before the remembering. B Regret We regret to inform you.