| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did [not/n't] [pers pn] think [prep] | 17 |
|
| 2 | why did [not/n't] [pers pn] think of | 17 |
|
| 3 | why did n't [pers pn] think [prep] | 16 |
|
| 4 | why did [not/n't] i think [prep] | 15 |
|
