| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which could [verb] | 1536 |
|
| 2 | which could [vb infin] | 1534 |
|
| 3 | which [modal v] increase | 62 |
|
| 4 | [pron] could increase | 35 |
|
| 5 | which could increase | 8 |
|
