| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there have [be] [det] occasions | 6 |
|
| 2 | there have been [det] occasions | 6 |
|
| 3 | there have be [det] occasions | 6 |
|
| 4 | there have [been] [det] occasions | 6 |
|
