| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [verb] for | 130 |
|
| 2 | [modal v] [vb infin] [v-ing] for | 108 |
|
| 3 | could [vb infin] [v-ing] [prep] | 89 |
|
| 4 | could [vb infin] [v-ing] [prep] | 89 |
|
| 5 | could [vb infin] [v-ing] for | 12 |
|
| 6 | could [verb] [v-ing] for | 12 |
|
