| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | year they have been [v-ing] | 15 |
|
| 2 | years they [verb] been [v-ing] | 14 |
|
| 3 | year they [vb base] been [v-ing] | 11 |
|
| 4 | year they have been [v-ing] | 7 |
|
