| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been a [adj] [noun] | 176 |
|
| 2 | [modal v] have been a [adj] experience | 11 |
|
| 3 | must have been [art] [adj] experience | 8 |
|
| 4 | must have been a [adj] experience | 8 |
|
| 5 | must [verb] been a [adj] experience | 8 |
|
| 6 | must have been [art] [adj] experience | 8 |
|
| 7 | must have [be] a [adj] experience | 8 |
|
| 8 | must have [been] a [adj] experience | 8 |
|
| 9 | must [vb infin] been a [adj] experience | 8 |
|
| 10 | must have been a [adj] experience | 8 |
|
| 11 | must have be a [adj] experience | 8 |
|
