| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [prep] be [v-ing] | 252 |
|
| 2 | [modal v] be [v-ing] [be] | 50 |
|
| 3 | [prep] be [v-ing] [be] | 46 |
|
| 4 | [modal v] [prep] be [be] | 9 |
|
