| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] it is refer [prep] | 5 |
|
| 2 | it is [adv] refer [prep] | 34 |
|
| 3 | it is [adv] refer [prep] | 34 |
|
| 4 | it is [adj] refer [prep] | 27 |
|
| 5 | it is [adj] refer [prep] | 26 |
|
| 6 | it is sometimes refer [prep] | 10 |
|
| 7 | it is sometimes refer [prep] | 10 |
|
| 8 | it is necessary refer [prep] | 8 |
|
| 9 | it is necessary refer [prep] | 8 |
|
| 10 | it is often refer [prep] | 7 |
|
| 11 | it is often refer [prep] | 7 |
|
| 12 | it is refer to [prep] | 10 |
|
| 13 | it is refer to [prep] | 10 |
|
| 14 | it is refer [prep] [prep] | 10 |
|
| 15 | it is refer [prep] [prep] | 10 |
|
| 16 | it is refer [prep] [prep] | 10 |
|
| 17 | it is refer [prep] [prep] | 10 |
|
| 18 | it is refer [prep] as | 6 |
|
| 19 | it is refer [prep] as | 6 |
|
