| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [verb] at | 249 |
|
| 2 | must be [vb pp] at | 229 |
|
| 3 | [modal v] be looked at | 100 |
|
| 4 | [vb mod] be looked at | 100 |
|
| 5 | must be look at | 26 |
|
| 6 | must be looked [prep] | 24 |
|
| 7 | must be looked [prep] | 24 |
|
| 8 | must [be] looked at | 18 |
|
| 9 | must [be] looked at | 18 |
|
| 10 | must be looked at | 18 |
|
| 11 | must be looked at | 18 |
|
| 12 | must be looked at | 18 |
|
