| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have be operating for [adv] | 6 |
|
| 2 | have been operating for [adv] | 6 |
|
| 3 | have be operating for [adv] | 6 |
|
| 4 | has be operating for [adv] | 5 |
|
