| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] they could [adv] afford | 12 |
|
| 2 | [vb past] they could [not/n't] afford | 12 |
|
| 3 | [vb past] they could not afford | 12 |
|
| 4 | [vb past] they could n't afford | 7 |
|
| 5 | [vb past] they could not afford | 5 |
|
