| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] [vb infin] [adv prt] [adj] | 169 |
|
| 2 | could [not/n't] [vb infin] [adv] [adj] | 164 |
|
| 3 | could [adv] [vb infin] [adv prt] [adj] | 82 |
|
| 4 | could [not/n't] [verb] [adv prt] [adj] | 39 |
|
