| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] [been] [verb] for [noun] | 59 |
|
| 2 | it [verb] [been] [verb] for [noun pl] | 31 |
|
| 3 | [pron] [verb] [been] [verb] for centuries | 9 |
|
| 4 | it [verb] [been] [verb] [prep] centuries | 6 |
|
| 5 | it [verb] [be] [verb] for centuries | 6 |
|
| 6 | it [verb] [been] [verb] for century | 6 |
|
