| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [vb pp] a | 2745 |
|
| 2 | should have [vb pp] [art] | 563 |
|
| 3 | should have [verb] a | 228 |
|
| 4 | should [verb] [vb pp] a | 223 |
|
| 5 | should [vb infin] [vb pp] a | 223 |
|
| 6 | should have [vb pp] a | 221 |
|
