| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been for [noun] | 21 |
|
| 2 | it had been for [noun] | 15 |
|
| 3 | it have been for [noun pl] | 15 |
|
| 4 | it have been for century | 6 |
|
| 5 | it have been for centuries | 6 |
|
