| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [pron] should know | 5 |
|
| 2 | [prep] [art] [noun] [pron] should know | 5 |
|
| 3 | [prep] [art] [noun] [pron] should know | 5 |
|
