| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [verb] [Wh det] have happened [prep] | 29 |
|
| 2 | not [verb] [pron] have happened to | 28 |
|
| 3 | not [verb] what have happened [prep] | 28 |
|
| 4 | not [verb] what have happened [prep] | 28 |
|
| 5 | not [vb infin] [pron] have happened [prep] | 25 |
|
| 6 | not know [pron] have happened [prep] | 20 |
|
| 7 | n't [verb] [pron] have happened [prep] | 20 |
|
| 8 | not know [pron] have happened [prep] | 17 |
|
| 9 | not [verb] [pron] 's happened [prep] | 14 |
|
| 10 | not [verb] [pron] had happened [prep] | 10 |
|
| 11 | not [verb] [pron] have happened [prep] | 10 |
|
| 12 | not [verb] [pron] has happened [prep] | 5 |
|
