| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] have been some improvement | 6 |
|
| 2 | [ex0] [vb -s] been some improvement | 6 |
|
| 3 | there [verb] been some improvement | 6 |
|
| 4 | [ex0] has been some improvement | 6 |
|
