| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how [adj] | 26707 |
|
| 2 | how [adj] | 12483 |
|
| 3 | [adv] difficult | 8917 |
|
| 4 | [Wh adv] difficult | 259 |
|
| 5 | how difficult | 236 |
|
| 6 | how difficult | 236 |
|
