| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [modal v] have [noun] | 63 |
|
| 2 | [pron] [modal v] have difficulty | 46 |
|
| 3 | who [modal v] [vb infin] difficulty | 8 |
|
| 4 | who [modal v] [verb] difficulty | 8 |
|
| 5 | who [modal v] have difficulty | 7 |
|
