| We _____ (never meet) that man before. | We have never met that man before. |
| She _____ (help) me with my problem. | She hasn't helped me with my problem. |
| The students _____ (study) hard enough this term. | The students haven't studied hard enough this term. |
| The children _____ ( come) to the park. | The children haven't come to the park. |
| My cats _____ (eat) anything. | My cats have not eaten anything. |
| I _____ (have) lunch yet. | I have not had lunch yet. |
| They _____ (phone) me. | They haven't phoned me. |