| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had been [verb] for | 65 |
|
| 2 | it had been [vb pp] for | 48 |
|
| 3 | it had been [v-ing] for | 17 |
|
| 4 | it had been know for | 6 |
|
| 5 | it had been known for | 6 |
|
| 6 | it had been use for | 5 |
|
| 7 | it had been used for | 5 |
|
