| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] [adv prt] a | 18 |
|
| 2 | could n't [verb] [adv prt] a | 10 |
|
| 3 | could not [verb] [adv prt] a | 8 |
|
| 4 | could [not/n't] [verb] up a | 7 |
|
