| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] been [verb] | 15899 |
|
| 2 | [adv] been [v-ing] | 1167 |
|
| 3 | [adv] be operating | 17 |
|
| 4 | [adv] [be] operating | 17 |
|
| 5 | [adv] been operate | 10 |
|
| 6 | [adv] been operating | 7 |
|
| 7 | [adv] [been] operating | 7 |
|
