| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] have been [adj] [adj] studies | 10 |
|
| 2 | there have been [adj] [adj] studies | 10 |
|
| 3 | [pron] have been [adj] [adj] studies | 10 |
|
| 4 | there have been [adj] [adj] studies | 10 |
|
| 5 | have been [adj] [adj] studies of | 7 |
|
| 6 | have been [adj] [adj] studies [prep] | 7 |
|
| 7 | have been [adj] [adj] studies of | 7 |
|
| 8 | have been [adj] [adj] studies [prep] | 7 |
|
