| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] refer to [prep] | 683 |
|
| 2 | be refer to [prep] | 124 |
|
| 3 | [adv] be refer [prep] | 55 |
|
| 4 | [adv] be refer to | 51 |
|
