| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] | 9030 |
|
| 2 | have been [v-ing] | 1166 |
|
| 3 | [verb] been operating | 92 |
|
| 4 | have been operating | 92 |
|
| 5 | have been operate | 7 |
|
| 6 | have [be] operating | 5 |
|
| 7 | have be operating | 5 |
|
| 8 | [vb infin] been operating | 5 |
|
| 9 | have [been] operating | 5 |
|
