| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] to [be] [verb] | 8538 |
|
| 2 | [verb] to [be] [v-ing] | 5344 |
|
| 3 | [vb past] [prep] [be] [v-ing] | 1697 |
|
