| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been used [prep] a [noun] | 139 |
|
| 2 | has been [prep] a [noun] | 81 |
|
| 3 | has been used [prep] [noun] | 77 |
|
| 4 | has been used [prep] a | 76 |
|
