| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used [prep] a | 131 |
|
| 2 | [adv] been used [prep] a | 37 |
|
| 3 | [adv] have been [prep] a | 33 |
|
| 4 | [adv] have been used [prep] | 28 |
|
