| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] had to do | 26 |
|
| 2 | 've have to do | 17 |
|
| 3 | have have to do | 9 |
|
| 4 | do have to do | 7 |
|
| 5 | [vb base] have to do | 7 |
|
