| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a difficult time | 22 |
|
| 2 | have [art] difficult time | 17 |
|
| 3 | [vb past] [art] difficult time | 10 |
|
| 4 | had [art] difficult time | 8 |
|
| 5 | had [art] difficult time | 5 |
|
| 6 | [vb pp] [art] difficult time | 5 |
|
