| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [art] [noun] [prep] studies | 11 |
|
| 2 | have been [art] [noun] of studies | 11 |
|
| 3 | have been a [noun] [prep] studies | 11 |
|
| 4 | have been [art] [noun sg] [prep] studies | 11 |
|
| 5 | have been a [noun] [prep] studies | 11 |
|
| 6 | have been [art] [noun] [prep] studies | 10 |
|
| 7 | have been [art] number [prep] studies | 8 |
|
| 8 | have been [art] number [prep] studies | 8 |
|
