| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they do [adv] happen | 12 |
|
| 2 | they do [not/n't] happen | 11 |
|
| 3 | they do not happen | 11 |
|
| 4 | they do n't happen | 7 |
|
| 5 | they did [adv] happen | 6 |
|
| 6 | they do [adv] happen | 6 |
|
