| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [verb] | 783 |
|
| 2 | must have be [v-ing] | 280 |
|
| 3 | [vb mod] have be trying | 15 |
|
| 4 | [modal v] have be trying | 15 |
|
| 5 | must have be try | 7 |
|
| 6 | must have be trying | 5 |
|
| 7 | must [vb infin] be trying | 5 |
|
| 8 | must have be trying | 5 |
|
| 9 | must [verb] be trying | 5 |
|
| 10 | must have [be] trying | 5 |
|
