| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] be replaced by | 27 |
|
| 2 | [vb past] to be replaced by | 27 |
|
| 3 | had [prep] be replaced by | 11 |
|
| 4 | began [prep] be replaced by | 8 |
|
