| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] to [be] | 18246 |
|
| 2 | to [be] [v-ing] | 7591 |
|
| 3 | [vb past] [be] [v-ing] | 7136 |
|
| 4 | [vb past] to [v-ing] | 635 |
|
