| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] have been operating | 10 |
|
| 2 | [noun pl] have been operating | 7 |
|
| 3 | [pron] have been operating | 6 |
|
| 4 | have been operating [prep] | 12 |
|
| 5 | have been operating [prep] | 12 |
|
| 6 | have been operating in | 5 |
|
| 7 | have been operating in | 5 |
|
