| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have to work a | 18 |
|
| 2 | [vb past] to work a | 9 |
|
| 3 | had to work a | 6 |
|
| 4 | have to work a | 5 |
|
| 5 | [vb pp] to work a | 5 |
|
| 6 | [vb infin] to work a | 5 |
|
