| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not have to | 1009 |
|
| 2 | n't have to | 665 |
|
| 3 | not have to | 363 |
|
| 4 | not had to | 10 |
|
| 5 | not have to | 5 |
|
