| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it must [vb infin] [be] | 122 |
|
| 2 | [v-ing] [conj] it must [vb infin] | 13 |
|
| 3 | [v-ing] [conj] it must [be] | 5 |
|
