| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [adv] been used for | 13 |
|
| 2 | had [adv] [been] used for | 13 |
|
| 3 | had [adv] [be] used for | 13 |
|
| 4 | had [adv] be used for | 13 |
|
| 5 | had [adv] [be] used for | 7 |
|
| 6 | had not [be] used for | 6 |
|
| 7 | had not [be] used for | 6 |
|
| 8 | had [not/n't] [be] used for | 6 |
|
