Verbs: patterns and past deductions

Verb patterns change meaning

A following to-infinitive or -ing form can change a verb’s meaning. Remember to do means not forgetting a task; remember doing means recalling a past experience.

Worked example: Remember to lock the door before you leave. This is a task still to be done.

Evidence and past deductions

Use modal + have + past participle for views about the past. Must have expresses a strong deduction; might have expresses a possibility, not a proven fact.

Worked example: The lights are off and their bags are gone. They must have left. This is a strong deduction from clues; the speaker could still be mistaken.

Try before checking

1. Choose the reminder about a task: Please remember ___ the booking before noon.
   • confirming
   • to confirm
   • confirmed
2. Which means I recall a completed phone call?
   • I remember to call her.
   • I remember calling her.
   • I remember call her.
3. You are unsure why a customer missed a call. Which sentence keeps the explanation tentative?
   • They definitely ignored it.
   • They might have been busy.
   • They must be busy yesterday.

The app includes the full guided practice and independent office-note writing with a separate model.