| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | letter have been [verb] to [noun] | 6 |
|
| 2 | letters [vb base] been [verb] to [noun] | 6 |
|
| 3 | letter [vb base] been [vb pp] to [noun] | 6 |
|
| 4 | letter [vb base] been sent to [noun] | 6 |
|
| 5 | letter [vb base] been send to [noun] | 6 |
|
