| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | years there have been [adj] | 31 |
|
| 2 | years there have [be] [adj] | 31 |
|
| 3 | years there have be [adj] | 31 |
|
| 4 | years there have [been] [adj] | 31 |
|
| 5 | years there has [be] [adj] | 17 |
|
| 6 | years there have [be] [adj] | 11 |
|
| 7 | years there have [be] increasing | 6 |
|
| 8 | years there have [be] considerable | 6 |
|
