| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] either [art] | 26 |
|
| 2 | should [verb] either [art] | 26 |
|
| 3 | should [verb] either a | 23 |
|
| 4 | should [verb] either a | 23 |
|
| 5 | should specify either [art] | 20 |
|
| 6 | should specify either [art] | 20 |
|
