| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have be operate in | 17 |
|
| 2 | have been operate in | 17 |
|
| 3 | have be operating in | 16 |
|
| 4 | have be operate in | 5 |
|
| 5 | has be operate in | 5 |
|
