| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] have been at this | 5 |
|
| 2 | have been [verb] at this | 18 |
|
| 3 | have been [vb pp] at this | 11 |
|
| 4 | have been [v-ing] at this | 7 |
|
| 5 | have been at this [noun sg] | 8 |
|
| 6 | have been at this [noun] | 8 |
|
