| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have [be] obliged | 8 |
|
| 2 | they [verb] be obliged | 8 |
|
| 3 | they [verb] been obliged | 8 |
|
| 4 | they [verb] [been] obliged | 8 |
|
| 5 | they [vb past] [be] obliged | 6 |
|
| 6 | they had [be] obliged | 5 |
|
