| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [am/are] [verb] [prep] | 63322 |
|
| 2 | difficult [verb] [prep] | 1442 |
|
| 3 | [am/are] difficult [verb] | 344 |
|
| 4 | [am/are] difficult [prep] | 19 |
|
