| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had to be | 5406 |
|
| 2 | has to be | 4534 |
|
| 3 | have to be | 4229 |
|
| 4 | have to be | 3284 |
|
| 5 | had to be | 324 |
|
| 6 | having to be | 147 |
|
| 7 | to have to be | 83 |
|
| 8 | 've to be | 8 |
|
