| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have to be | 18021 |
|
| 2 | had to be | 5409 |
|
| 3 | has to be | 4534 |
|
| 4 | have to be | 4230 |
|
| 5 | have to be | 3285 |
|
| 6 | had to be | 325 |
|
| 7 | having to be | 147 |
|
| 8 | to have to be | 83 |
|
| 9 | 've to be | 8 |
|
