| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to be [verb] [prep] | 41002 |
|
| 2 | [prep] be [v-ing] [prep] | 1979 |
|
| 3 | to be [v-ing] [prep] | 1895 |
|
| 4 | to [be] [v-ing] [prep] | 1893 |
|
