| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had been [verb] for | 65 |
|
| 2 | it had been [vb pp] for | 48 |
|
| 3 | it [verb] been known for | 37 |
|
| 4 | it have been known for | 37 |
|
| 5 | it had been known [prep] | 8 |
|
| 6 | it had been known [prep] | 8 |
|
| 7 | [pron] had been known for | 6 |
|
| 8 | it [vb past] been known for | 6 |
|
| 9 | it had been know for | 6 |
|
| 10 | it had been known for | 6 |
|
| 11 | it had [been] known for | 6 |
|
| 12 | it had [be] known for | 6 |
|
| 13 | it had be known for | 6 |
|
