| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | mean they must [vb infin] | 16 |
|
| 2 | mean they must [vb infin] | 8 |
|
| 3 | means they must [vb infin] | 6 |
|
| 4 | mean they must have | 6 |
|
