| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] have [been] [adv] [det] [noun] | 133 |
|
| 2 | [ex0] have [been] [adv] [adj] research | 8 |
|
| 3 | [ex0] [verb] [been] [adv] [det] research | 7 |
|
| 4 | [ex0] have [be] [adv] [det] research | 7 |
|
| 5 | [pron] have [been] [adv] [det] research | 7 |
|
