| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] difficult [to-vb] [adv] [art] [noun sg] | 8 |
|
| 2 | be difficult [verb] [adv] [art] [noun sg] | 8 |
|
| 3 | [be] difficult [verb] [adv] [art] [noun sg] | 8 |
|
| 4 | [be] difficult [verb] [adv] the [noun sg] | 8 |
|
