| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] question must be | 14 |
|
| 2 | [det] question must be | 14 |
|
| 3 | [det] question must [be] | 14 |
|
| 4 | [det] questions must [be] | 10 |
|
| 5 | these question must [be] | 6 |
|
