| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [pron] must have [been] | 77 |
|
| 2 | but [pers pn] must have [been] | 59 |
|
| 3 | but it must have [been] | 32 |
|
| 4 | but it must have [been] | 32 |
|
| 5 | but there must have [been] | 16 |
|
| 6 | but [ex0] must have [been] | 16 |
|
| 7 | but there must have [been] | 16 |
|
| 8 | but he must have [been] | 12 |
|
| 9 | but he must have [been] | 12 |
|
| 10 | but must have [been] [adj] | 6 |
|
