| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] a [adj] | 262 |
|
| 2 | have been used [prep] a | 149 |
|
| 3 | have been used [prep] [adj] | 104 |
|
| 4 | been used [prep] a [adj] | 45 |
|
| 5 | have used [prep] a [adj] | 8 |
|
