| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] they [vb past] [pers pn] difficult | 7 |
|
| 2 | they [vb past] [pers pn] [adv] difficult | 5 |
|
| 3 | they [vb past] [pers pn] [adv] difficult | 5 |
|
| 4 | they [vb past] [pers pn] difficult [verb] | 10 |
|
| 5 | they [vb past] [pers pn] difficult [to-vb] | 10 |
|
