| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [not/n't] happen [verb] | 31 |
|
| 2 | do [adv] happen [verb] | 31 |
|
| 3 | [vb base] not happen [verb] | 31 |
|
| 4 | [vb base] [adv] happen [to-vb] | 31 |
|
| 5 | [vb base] n't happen [verb] | 28 |
|
| 6 | [vb base] [adv] happen to know | 8 |
|
| 7 | [vb base] [adv] happen know | 8 |
|
| 8 | [vb base] [adv] happen have | 6 |
|
| 9 | [vb base] [adv] happen to have | 6 |
|
