| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] letter which [pron] [verb] to | 7 |
|
| 2 | [art] letter [Wh det] [pron] [vb past] to | 7 |
|
| 3 | [art] letter [Wh det] [pers pn] [verb] to | 7 |
|
| 4 | [art] letter [Wh det] [pron] wrote to | 6 |
|
| 5 | [art] letter [Wh det] [pron] write to | 6 |
|
| 6 | a letter [Wh det] [pron] [verb] to | 5 |
|
