| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] may [be] [adj] | 333 |
|
| 2 | [pron] may [be] difficult | 119 |
|
| 3 | [Wh det] [modal v] [be] difficult | 44 |
|
| 4 | [Wh det] may [be] difficult | 11 |
|
