| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] is a [noun] | 800 |
|
| 2 | is a useful [noun] | 242 |
|
| 3 | [noun pl] is a useful | 18 |
|
| 4 | [noun pl] a useful [noun] | 7 |
|
