| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [adv] used [prep] | 66 |
|
| 2 | which have been used [prep] | 61 |
|
| 3 | which have been [adv] [prep] | 13 |
|
| 4 | which have been [adv] used | 7 |
|
