| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [subord] it is [to-vb] | 8 |
|
| 2 | [vb mod] [vb infin] [subord] it is [to-vb] | 8 |
|
| 3 | must [vb infin] [subord] it is [to-vb] | 5 |
|
| 4 | must [vb infin] [subord] it is [to-vb] | 5 |
|
| 5 | [vb infin] [subord] it is [adj] [to-vb] | 6 |
|
| 6 | [vb infin] [subord] it is [adj] [to-vb] | 6 |
|
