| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] they [modal v] to do | 15 |
|
| 2 | [verb] they [vb mod] to do | 15 |
|
| 3 | [verb] they used to do | 10 |
|
| 4 | [verb] they used to do | 10 |
|
| 5 | [vb base] they [modal v] to do | 9 |
|
| 6 | [vb past] they [modal v] to do | 5 |
|
| 7 | [verb] they ought to do | 5 |
|
| 8 | [verb] they ought to do | 5 |
|
