| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] should [vb infin] | 323 |
|
| 2 | [is] [verb] [vb infin] | 71 |
|
| 3 | [is] [verb] should | 41 |
|
| 4 | [is] should [vb infin] | 20 |
|
