| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an [noun] [conj] [modal v] [verb] | 198 |
|
| 2 | an [noun sg] [conj] [modal v] [verb] | 195 |
|
| 3 | [art] operation [conj] [modal v] [verb] | 8 |
|
| 4 | [art] operation [conj] [modal v] [verb] | 8 |
|
| 5 | a operation [conj] [modal v] [verb] | 6 |
|
| 6 | an operation [conj] [modal v] [verb] | 6 |
|
