| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [verb] to be | 1421 |
|
| 2 | had [verb] to be | 600 |
|
| 3 | which had [verb] to | 186 |
|
| 4 | which had to be | 177 |
|
| 5 | which had [verb] be | 10 |
|
