| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is usually [verb] [prep] | 785 |
|
| 2 | is [adv] refer [prep] | 216 |
|
| 3 | is [adv] refer [prep] | 206 |
|
| 4 | [be] usually refer [prep] | 35 |
|
| 5 | be usually refer [prep] | 35 |
|
| 6 | [is] usually refer [prep] | 23 |
|
| 7 | is usually refer [prep] | 22 |
|
