| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | exist and [vb mod] have been [verb] | 11 |
|
| 2 | exist and [vb mod] [vb infin] been [verb] | 11 |
|
| 3 | exist and [vb mod] have been [verb] | 11 |
|
| 4 | exist and [vb mod] [verb] been [vb pp] | 11 |
|
| 5 | exist and must [verb] been [verb] | 11 |
|
| 6 | exist and [vb mod] [verb] been submitted | 9 |
|
| 7 | exist and [vb mod] [verb] been submit | 9 |
|
