| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] it [modal v] [vb infin] | 686 |
|
| 2 | [is] [adj] it [modal v] | 134 |
|
| 3 | [is] [adj] [modal v] [vb infin] | 66 |
|
| 4 | [is] it [modal v] [vb infin] | 17 |
|
