| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] have difficulty in | 56 |
|
| 2 | [modal v] have difficulty in | 53 |
|
| 3 | may have difficulty in | 23 |
|
| 4 | may have difficulty in | 23 |
|
| 5 | will have difficulty in | 18 |
|
| 6 | will have difficulty in | 18 |
|
| 7 | would have difficulty in | 9 |
|
| 8 | would have difficulty in | 8 |
|
