| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb base] been [v-ing] for | 42 |
|
| 2 | they 've been [v-ing] for | 28 |
|
| 3 | they have been [v-ing] for | 14 |
|
| 4 | they [vb base] been waiting for | 7 |
|
