| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [verb] taken a [noun sg] | 9 |
|
| 2 | should [vb infin] taken a [noun] | 9 |
|
| 3 | should have taken a [noun] | 9 |
|
| 4 | should have taken a [noun] | 9 |
|
