| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be [art] [adv] difficult | 23 |
|
| 2 | to be [art] [adv] difficult | 23 |
|
| 3 | [prep] be the [adv] difficult | 14 |
|
| 4 | [prep] be the [adv] difficult | 14 |
|
| 5 | [prep] be [art] most difficult | 13 |
|
| 6 | [prep] be a [adv] difficult | 9 |
|
| 7 | [prep] be a [adv] difficult | 5 |
|
