| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this may have been [adj] [prep] | 16 |
|
| 2 | this may have been [adj] [prep] | 15 |
|
| 3 | this may have been [vb pp] [prep] | 14 |
|
| 4 | this may have been [verb] [prep] | 14 |
|
| 5 | this may have been due [prep] | 9 |
|
| 6 | this may have been due [prep] | 9 |
|
