| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] [pers pn] at first | 8 |
|
| 2 | could [not/n't] [vb infin] [pers pn] [prep] first | 8 |
|
| 3 | could n't [verb] [pers pn] [prep] first | 7 |
|
| 4 | could [not/n't] [verb] it [prep] first | 6 |
|
