1. Past Present

2. FORM has/have + been + present participle The present perfect is used to emphasize the concept of duration. It often implies that the action or state of being will continue. Positive Negative Question I have been eating I have not been eating Have I been eating?

3. FORM Verb + ed The simple past tense expresses completed action at a definite time in the past Positive Negative Question I waited I did not wait Did I wait?