| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] for | 714 |
|
| 2 | could be [verb] for | 670 |
|
| 3 | could be [v-ing] [prep] | 167 |
|
| 4 | could be [v-ing] [prep] | 167 |
|
| 5 | could be [v-ing] for | 26 |
|
| 6 | could be [v-ing] for | 26 |
|
| 7 | could [be] [v-ing] for | 26 |
|
| 8 | could [be] [v-ing] for | 26 |
|
