| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be the [adv] | 514 |
|
| 2 | [prep] the [adv] difficult | 214 |
|
| 3 | [prep] be [adv] difficult | 96 |
|
| 4 | be the [adv] difficult | 27 |
|
