| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] [adv] | 366 |
|
| 2 | have been operating [prep] | 50 |
|
| 3 | have been operating [adv] | 11 |
|
| 4 | been operating [prep] [adv] | 8 |
|
