| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have difficulties | 31 |
|
| 2 | have difficulties | 28 |
|
| 3 | had difficulties | 25 |
|
| 4 | having difficulties | 23 |
|
| 5 | has difficulties | 6 |
|
| 6 | had difficulties | 6 |
|
| 7 | to have difficulties | 5 |
|
