| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [vb pp] [conj] | 9801 |
|
| 2 | should be [vb pp] [conj] | 2516 |
|
| 3 | it should be [vb pp] | 2131 |
|
| 4 | it should be [conj] | 32 |
|
