| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [modal v] have been useful | 13 |
|
| 2 | [noun sg] [modal v] have been useful | 8 |
|
| 3 | [pron] [modal v] have been useful | 7 |
|
| 4 | [pers pn] [modal v] have been useful | 5 |
|
| 5 | it [modal v] have been useful | 5 |
|
| 6 | it [modal v] have been useful | 5 |
|
| 7 | [modal v] have been [adv] useful | 7 |
|
| 8 | [modal v] have been [adv] useful | 7 |
|
| 9 | [modal v] have been useful [to-vb] | 5 |
|
| 10 | [modal v] have been useful [verb] | 5 |
|
