| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be refer to | 44 |
|
| 2 | it be referred to | 42 |
|
| 3 | it is refer to | 17 |
|
| 4 | it was refer to | 13 |
|
| 5 | it be refer to | 9 |
|
