| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] [vb pp] [adv prt] | 1739 |
|
| 2 | [modal v] [vb infin] [vb pp] [adv prt] | 1739 |
|
| 3 | could [vb infin] [vb pp] [adv] | 677 |
|
| 4 | could [vb infin] [verb] [adv prt] | 407 |
|
| 5 | could [vb infin] [vb pp] [adv prt] | 298 |
|
| 6 | could [verb] [vb pp] [adv prt] | 298 |
|
