| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it should [not/n't] [vb infin] [be] [vb pp] | 5 |
|
| 2 | it should [not/n't] [vb infin] been [vb pp] | 5 |
|
| 3 | it should [not/n't] [vb infin] be [vb pp] | 5 |
|
| 4 | it should [not/n't] [vb infin] [been] [vb pp] | 5 |
|
