| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been operating [adv] | 11 |
|
| 2 | [verb] been operating [adv] | 11 |
|
| 3 | has been operating [adv] | 6 |
|
| 4 | [vb -s] been operating [adv] | 6 |
|
| 5 | been operating [prep] [adv] | 8 |
|
| 6 | been operating [prep] [adv] | 8 |
|
| 7 | been operating for [adv] | 7 |
|
| 8 | been operating for [adv] | 7 |
|
| 9 | been operating [adv] [prep] | 7 |
|
| 10 | been operating [adv] [prep] | 7 |
|
