| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] there have been a | 94 |
|
| 2 | years there have [been] a | 70 |
|
| 3 | [noun pl] there has [been] a | 63 |
|
| 4 | [noun pl] there had [been] a | 15 |
|
| 5 | [noun pl] there have [been] a | 10 |
|
| 6 | months there have [been] a | 6 |
|
| 7 | [noun pl] there 's [been] a | 5 |
|
