| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] an [noun sg] | 118 |
|
| 2 | it must [vb infin] [noun sg] | 39 |
|
| 3 | it must [vb infin] an | 20 |
|
| 4 | it [vb infin] an [noun sg] | 15 |
|
