| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [art] letter to [noun] | 12 |
|
| 2 | [v-ing] a letter to [noun] | 10 |
|
| 3 | [v-ing] a letter to [noun] | 10 |
|
| 4 | [v-ing] [art] letter to [noun prp] | 9 |
|
| 5 | writing [art] letter to [noun] | 6 |
|
