| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] in operation [prep] some | 5 |
|
| 2 | have be in operation [prep] some | 5 |
|
| 3 | have been in operation [prep] some | 5 |
|
| 4 | have [be] in operation for some | 5 |
|
| 5 | have [be] in operation [prep] some | 5 |
|
| 6 | have [be] in operation [prep] some | 5 |
|
| 7 | have [be] in operation for some | 5 |
|
