| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been used for | 62 |
|
| 2 | has [not/n't] been used | 30 |
|
| 3 | [not/n't] been used for | 17 |
|
| 4 | has [not/n't] been for | 9 |
|
