| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [been] a relief | 8 |
|
| 2 | [vb mod] have [been] a relief | 8 |
|
| 3 | [modal v] have been a relief | 8 |
|
| 4 | must have [been] a relief | 6 |
|
| 5 | must have [been] a relief | 6 |
|
