| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [n mass] [modal v] be [v-ing] | 202 |
|
| 2 | [noun] could be [v-ing] | 186 |
|
| 3 | [n mass] could be [verb] | 141 |
|
| 4 | [n mass] could [be] [v-ing] | 8 |
|
