| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] for | 5399 |
|
| 2 | have been operate [prep] | 63 |
|
| 3 | [verb] been operate for | 15 |
|
| 4 | have [been] operate for | 15 |
|
| 5 | have be operate for | 15 |
|
| 6 | have [be] operate for | 15 |
|
