| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] [prep] [art] | 7075 |
|
| 2 | [verb] been operate [prep] [art] | 18 |
|
| 3 | have been operate [prep] [art] | 18 |
|
| 4 | [vb past] been operate [prep] [art] | 7 |
|
| 5 | had [been] operate [prep] [art] | 7 |
|
| 6 | had been operate [prep] [art] | 7 |
|
| 7 | had be operate [prep] [art] | 7 |
|
| 8 | had [be] operate [prep] [art] | 7 |
|
