| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] been [verb] | 20880 |
|
| 2 | [adv] been [v-ing] | 1678 |
|
| 3 | [adv] be operating | 17 |
|
| 4 | [adv] [be] operating | 17 |
|
| 5 | [adv] been operate | 11 |
|
| 6 | [adv] [been] operating | 7 |
|
