| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [verb] [noun] | 3261 |
|
| 2 | should [vb infin] [noun] | 3257 |
|
| 3 | [modal v] contact [noun] | 246 |
|
| 4 | should contact [noun] | 150 |
|
