| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which could [verb] | 1536 |
|
| 2 | which could [vb infin] | 1534 |
|
| 3 | which [modal v] mean | 177 |
|
| 4 | [pron] could mean | 133 |
|
| 5 | which could mean | 31 |
|
