| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how [verb] [det] [verb] | 198 |
|
| 2 | how [verb] [det] [vb infin] | 187 |
|
| 3 | [adv] [verb] [det] happen | 82 |
|
| 4 | [Wh adv] [verb] [det] happen | 51 |
|
| 5 | how [verb] [det] happen | 22 |
|
| 6 | how [verb] [det] happen | 19 |
|
| 7 | how [verb] [adj] happen | 19 |
|
