| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | letters have [be] send to | 9 |
|
| 2 | letters have [been] send [prep] | 9 |
|
| 3 | letters have be send [prep] | 9 |
|
| 4 | letters have [be] sent [prep] | 9 |
|
| 5 | letters have been send [prep] | 9 |
|
| 6 | letters have [be] send [prep] | 8 |
|
