| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [vb pp] [prep] | 12840 |
|
| 2 | be [vb pp] refer [prep] | 86 |
|
| 3 | it be refer [prep] | 45 |
|
| 4 | it be [vb pp] refer | 5 |
|
