| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] in some [noun pl] | 29 |
|
| 2 | have been [vb pp] in some [noun pl] | 12 |
|
| 3 | have been [vb pp] in some cases | 8 |
|
| 4 | have been [vb pp] in some quarters | 7 |
|
| 5 | had been [vb pp] in some [noun pl] | 6 |
|
| 6 | have been [vb pp] in some studies | 6 |
|
| 7 | have been [vb pp] in some patients | 5 |
|
| 8 | have been found in some [noun pl] | 5 |
|
| 9 | have been used in some [noun pl] | 5 |
|
