| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is use [prep] [adj] | 163 |
|
| 2 | is often use [prep] | 83 |
|
| 3 | often use [prep] [adj] | 35 |
|
| 4 | is often [prep] [adj] | 15 |
|
