| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [be] [verb] at | 25 |
|
| 2 | it must be [verb] at | 25 |
|
| 3 | it must be [verb] at | 25 |
|
| 4 | it must [be] [verb] at | 25 |
|
| 5 | it must have [verb] at | 10 |
|
| 6 | it must [vb infin] [verb] at | 10 |
|
| 7 | it must [verb] [verb] at | 10 |
|
| 8 | it must have [verb] at | 10 |
|
| 9 | it must [verb] [vb pp] at | 10 |
|
| 10 | it must [verb] [verb] at | 10 |
|
| 11 | it must [verb] [be] at | 5 |
|
| 12 | it must [verb] been at | 5 |
|
| 13 | it must [verb] [been] at | 5 |
|
| 14 | it must [verb] be at | 5 |
|
| 15 | it must [verb] at [adv] | 5 |
|
| 16 | it must [verb] at [adv] | 5 |
|
