| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [vb pp] for [noun] | 51 |
|
| 2 | it have been [vb pp] for [noun] | 51 |
|
| 3 | it has been [vb pp] for [noun] | 30 |
|
| 4 | it have been [vb pp] for [noun pl] | 25 |
|
| 5 | it have been [vb pp] for [noun sg] | 18 |
|
| 6 | it had been [vb pp] for [noun] | 14 |
|
| 7 | it have been known for [noun] | 10 |
|
| 8 | it 's been [vb pp] for [noun] | 7 |
|
| 9 | it have been [vb pp] for century | 6 |
|
| 10 | it have been [vb pp] for centuries | 6 |
|
| 11 | it have been used for [noun] | 6 |
|
| 12 | it have been [vb pp] for [noun prp] | 5 |
|
