| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be used for this | 72 |
|
| 2 | be used for this | 35 |
|
| 3 | was used for this | 9 |
|
| 4 | is used for this | 8 |
|
| 5 | been used for this | 7 |
|
| 6 | are used for this | 6 |
|
| 7 | were used for this | 5 |
|
