| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there have been [adj] [noun] | 1745 |
|
| 2 | there have be [adj] study | 23 |
|
| 3 | there have [been] [adj] study | 23 |
|
| 4 | there [verb] been [adj] study | 23 |
|
| 5 | [pron] have been [adj] study | 23 |
|
| 6 | there have [be] [adj] study | 23 |
|
