| 1 | My grandparents walk twenty minutes a day. | |
| 2 | How long is it you wrote to your penpal? | |
| 3 | We have been dating a long time. | |
| 4 | That lady has been waiting for the bus noon. | |
| 5 | I studied for this test three days straight. | |
| 6 | My family has lived here last March. | |
| 7 | She has worked there she finished college. | |
| 8 | I have been calling you half an hour. | |
| 9 | Lisa and Jill have been at the library a long time. | |
| 10 | My teacher has been sick last Monday. | |