| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been operate [prep] | 17 |
|
| 2 | have be operate [prep] | 17 |
|
| 3 | have be operating [prep] | 12 |
|
| 4 | have be operate in | 5 |
|
| 5 | have be operated [prep] | 5 |
|
| 6 | have be operate in | 5 |
|
