| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [be] [v-ing] [pron] for | 10 |
|
| 2 | must [vb infin] [be] [v-ing] [pron] [prep] | 10 |
|
| 3 | must [vb infin] [be] [v-ing] [pron] [prep] | 10 |
|
| 4 | must [vb infin] [be] [v-ing] [pron] for | 6 |
|
| 5 | must [vb infin] [be] [verb] [pron] for | 6 |
|
| 6 | must [verb] [be] [v-ing] [pron] for | 6 |
|
