| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | did it [verb] | 1025 |
|
| 2 | did it [vb infin] | 964 |
|
| 3 | [verb] it happen | 269 |
|
| 4 | [vb past] it happen | 87 |
|
| 5 | do it happen | 84 |
|
| 6 | did [pron] happen | 77 |
|
| 7 | did it happen | 66 |
|
