| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [vb pp] [prep] | 12842 |
|
| 2 | be usually [vb pp] [prep] | 1541 |
|
| 3 | it be usually [vb pp] | 178 |
|
| 4 | it be usually [prep] | 53 |
|
