| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun] have been [prep] operation | 14 |
|
| 2 | [adj] [noun] [verb] been in operation | 14 |
|
| 3 | [adj] [noun sg] [verb] been [prep] operation | 12 |
|
| 4 | [adj] [noun] [vb -s] been [prep] operation | 8 |
|
| 5 | [adj] [noun] has been [prep] operation | 8 |
|
| 6 | [det] [noun] [verb] been [prep] operation | 6 |
|
| 7 | [adj] [noun] [verb] been [prep] operation | 6 |
|
