| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been operate [prep] [art] | 18 |
|
| 2 | have been operating [prep] [art] | 16 |
|
| 3 | have been operate [prep] the | 9 |
|
| 4 | had been operate [prep] [art] | 7 |
|
| 5 | have been operate [prep] a | 6 |
|
| 6 | have been operate in [art] | 5 |
|
| 7 | have been operate [prep] [art] | 5 |
|
| 8 | have been operate in [art] | 5 |
|
