| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been operating [prep] | 50 |
|
| 2 | have been operating [prep] | 50 |
|
| 3 | [vb -s] been operating [prep] | 24 |
|
| 4 | has been operating [prep] | 24 |
|
| 5 | [verb] been operating in | 16 |
|
| 6 | [verb] been operating in | 16 |
|
| 7 | [verb] been operating for | 15 |
|
| 8 | [verb] been operating for | 15 |
|
| 9 | [vb base] been operating [prep] | 12 |
|
| 10 | have been operating [prep] | 12 |
|
| 11 | had been operating [prep] | 8 |
|
| 12 | [vb past] been operating [prep] | 8 |
|
| 13 | [verb] been operating since | 6 |
|
| 14 | [verb] been operating since | 6 |
|
