| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [art] tough time | 12 |
|
| 2 | [v-ing] a tough time | 12 |
|
| 3 | [v-ing] a tough time | 12 |
|
| 4 | having [art] tough time | 11 |
|
