| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be if [pers pn] [modal v] [verb] | 63 |
|
| 2 | be obliged if [pers pn] [modal v] | 13 |
|
| 3 | obliged if [pers pn] [modal v] [verb] | 12 |
|
| 4 | be obliged if [pers pn] [verb] | 5 |
|
