| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] been [verb] | 9117 |
|
| 2 | [vb infin] been [v-ing] | 1214 |
|
| 3 | [verb] been operating | 92 |
|
| 4 | [vb infin] been operate | 7 |
|
| 5 | [vb infin] [be] operating | 5 |
|
| 6 | [vb infin] [been] operating | 5 |
|
| 7 | [vb infin] be operating | 5 |
|
