| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have made a [adj] study | 23 |
|
| 2 | have made a special study | 12 |
|
| 3 | have made a special study | 12 |
|
| 4 | has made a [adj] study | 11 |
|
| 5 | had made a [adj] study | 6 |
|
