| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [adv] been used for | 27 |
|
| 2 | has [adv] [been] used for | 14 |
|
| 3 | had [adv] [been] used for | 7 |
|
| 4 | have [adv] [been] used for | 6 |
|
| 5 | have never [been] used for | 5 |
|
| 6 | have only [been] used for | 5 |
|
