| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | often [vb base] an [noun sg] | 18 |
|
| 2 | often [vb -s] an [noun sg] | 9 |
|
| 3 | often [vb pp] an [noun sg] | 7 |
|
| 4 | often [vb infin] an [noun sg] | 6 |
|
