| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] operating in | 16 |
|
| 2 | have been operating in | 16 |
|
| 3 | have [be] operating in | 16 |
|
| 4 | have be operating in | 16 |
|
| 5 | have [be] operating in | 5 |
|
| 6 | has [be] operating in | 5 |
|
