| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] [verb] at | 647 |
|
| 2 | [be] [vb pp] [to-vb] at | 537 |
|
| 3 | [be] [vb pp] to operate [prep] | 82 |
|
| 4 | [be] [vb pp] to operate [prep] | 82 |
|
| 5 | [be] [vb pp] operate at | 13 |
|
| 6 | [be] [vb pp] to operate at | 11 |
|
| 7 | [be] [verb] to operate at | 11 |
|
