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activity to practice modal verbs use and structure ...

We use PRESENT PERFECT to events in the past but wich conected to the present. Although we do not give a specific time, we often use time expressions like EVER, NEVER, BEFORE, YET......

The PAST PERFECT TENSE indicates that an action was completed (finished or "perfected") at some point in the past before something else happened. This tense is formed with the past tense form of "to have" (HAD) plus the past participle of the verb (which can be either regular or irregular in form)...

Adding numbers...