| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] have been used for | 8 |
|
| 2 | [adv] [vb infin] been used for | 7 |
|
| 3 | [adv] have been used for | 7 |
|
| 4 | [adv] [verb] been used for | 7 |
|
