| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [is] | 65 |
|
| 2 | could [verb] [is] | 65 |
|
| 3 | could [verb] is | 65 |
|
| 4 | could do [is] | 29 |
|
| 5 | could do [is] | 29 |
|
