| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used [to-vb] [det] | 22 |
|
| 2 | has been used [verb] [det] | 8 |
|
| 3 | have been used [verb] this | 8 |
|
| 4 | have been used [verb] [det] | 7 |
|
