| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] refer to | 34 |
|
| 2 | it is [adv] refer [prep] | 34 |
|
| 3 | it is [adv] refer [prep] | 34 |
|
| 4 | it is [adv] referred [prep] | 33 |
|
| 5 | it is sometimes refer [prep] | 10 |
|
| 6 | it is sometimes refer [prep] | 10 |
|
| 7 | it is often refer [prep] | 7 |
|
| 8 | it is often refer [prep] | 7 |
|
