| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been used [prep] [noun] | 233 |
|
| 2 | have been [prep] [num] [noun] | 76 |
|
| 3 | have been used [prep] [num] | 27 |
|
| 4 | been used [prep] [num] [noun] | 16 |
|
