| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have operate [prep] | 34 |
|
| 2 | have operated [prep] | 23 |
|
| 3 | have operate in | 15 |
|
| 4 | have operate in | 15 |
|
| 5 | have to operate [prep] | 11 |
|
