| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had be [verb] [prep] | 17603 |
|
| 2 | had be [vb pp] [prep] | 15654 |
|
| 3 | [verb] be operated [prep] | 15 |
|
| 4 | have be operated [prep] | 13 |
|
| 5 | had be operate [prep] | 13 |
|
| 6 | had [be] operated [prep] | 5 |
|
| 7 | [vb past] be operated [prep] | 5 |
|
