| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [prep] [art] | 4046 |
|
| 2 | have [been] operating [prep] | 50 |
|
| 3 | [been] operating [prep] [art] | 18 |
|
| 4 | have [been] operating [art] | 8 |
|
