| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be used for this purpose | 40 |
|
| 2 | [be] used for this purpose | 40 |
|
| 3 | [be] used for this purpose | 20 |
|
| 4 | be used for this purpose | 20 |
|
| 5 | [was/were] used for this purpose | 8 |
|
| 6 | was used for this purpose | 5 |
|
| 7 | [am/are] used for this purpose | 5 |
|
