| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how do [pron] come about | 8 |
|
| 2 | how do [pron] come about | 8 |
|
| 3 | how do [pers pn] come about | 8 |
|
| 4 | how do it come about | 6 |
|
| 5 | how do it come about | 6 |
|
| 6 | how did [pron] come about | 5 |
|
