| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun] [is] often refer | 8 |
|
| 2 | [prep] [noun] [is] often refer | 5 |
|
| 3 | [prep] [noun] [is] often refer | 5 |
|
| 4 | [noun] [is] often refer [prep] | 21 |
|
| 5 | [noun] [is] often refer to | 21 |
|
| 6 | [noun] [is] often refer [prep] | 21 |
|
| 7 | [noun] [is] often refer to | 21 |
|
