| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [verb] [v-ing] to | 30 |
|
| 2 | should be [verb] [v-ing] to | 30 |
|
| 3 | should be [vb pp] [v-ing] to | 30 |
|
| 4 | should be [verb] according to | 29 |
|
