| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] [prep] | 65861 |
|
| 2 | been [v-ing] [prep] | 6838 |
|
| 3 | [be] operating [prep] | 299 |
|
| 4 | be operating [prep] | 299 |
|
| 5 | been operate [prep] | 75 |
|
| 6 | [been] operating [prep] | 60 |
|
| 7 | been operating [prep] | 60 |
|
