| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it had been [verb] for | 65 |
|
| 2 | it had been [vb pp] for | 48 |
|
| 3 | [pron] had been used for | 15 |
|
| 4 | it have been used for | 14 |
|
| 5 | it [verb] been used for | 14 |
|
| 6 | it had been used [prep] | 12 |
|
| 7 | it had been used [prep] | 12 |
|
| 8 | it had been use for | 5 |
|
| 9 | it had [be] used for | 5 |
|
| 10 | it [vb past] been used for | 5 |
|
| 11 | it had been used for | 5 |
|
| 12 | it had be used for | 5 |
|
| 13 | it had [been] used for | 5 |
|
