| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] know [pron] happen [prep] the | 6 |
|
| 2 | [not/n't] know what happen [prep] the | 6 |
|
| 3 | [not/n't] know [pron] happen [prep] the | 6 |
|
| 4 | [not/n't] know what happen [prep] the | 6 |
|
| 5 | [not/n't] know [Wh det] happen [prep] the | 6 |
|
| 6 | n't know [pron] happen [prep] the | 5 |
|
| 7 | [not/n't] know [pron] happened [prep] the | 5 |
|
