| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] [art] | 480 |
|
| 2 | been operate [prep] [art] | 20 |
|
| 3 | have been operate [prep] | 17 |
|
| 4 | have operate [prep] [art] | 15 |
|
