| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [vb mod] [adv] improve [noun] | 9 |
|
| 2 | [Wh det] [modal v] [adv] improve [noun] | 9 |
|
| 3 | which [modal v] [adv] improve [noun] | 9 |
|
| 4 | [Wh det] [modal v] [adv] improve [noun sg] | 7 |
|
