| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] [verb] been [verb] | 18944 |
|
| 2 | [noun pl] [verb] been [v-ing] | 1644 |
|
| 3 | [noun] [verb] been operating | 43 |
|
| 4 | [noun pl] [verb] been operate | 17 |
|
| 5 | [noun pl] [verb] [been] operating | 10 |
|
| 6 | [noun pl] [verb] be operating | 10 |
|
| 7 | [noun pl] [verb] [be] operating | 10 |
|
