| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] in | 11178 |
|
| 2 | been [v-ing] in | 903 |
|
| 3 | be operating in | 98 |
|
| 4 | [be] operating in | 98 |
|
| 5 | been operating [prep] | 60 |
|
| 6 | been operate in | 22 |
|
| 7 | [been] operating in | 20 |
|
