| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had be used for [det] | 6 |
|
| 2 | had [been] used for [det] | 6 |
|
| 3 | had been used for [det] | 6 |
|
| 4 | had [be] used for many | 5 |
|
