| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [adv] [det] research | 9 |
|
| 2 | have been [adv] [det] research | 9 |
|
| 3 | has been [adv] [det] research | 8 |
|
| 4 | have been [adv] little research | 7 |
|
