| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb past] been [v-ing] | 402 |
|
| 2 | [vb past] been [v-ing] at | 177 |
|
| 3 | they [vb past] [v-ing] at | 30 |
|
| 4 | they [vb past] been at | 23 |
|
