| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [adj] | 67488 |
|
| 2 | [modal v] be [adj] | 57109 |
|
| 3 | [modal v] be difficult | 1036 |
|
| 4 | [modal v] be difficult | 1036 |
|
| 5 | [modal v] [be] difficult | 1036 |
|
| 6 | [modal v] [be] difficult | 1036 |
|
