| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [be] used for [adj] purpose | 17 |
|
| 2 | [modal v] [be] used for [det] purpose | 17 |
|
| 3 | [modal v] be used for [adj] purpose | 17 |
|
| 4 | [modal v] [be] used for [adj] purpose | 17 |
|
| 5 | [modal v] be used for [adj] purpose | 17 |
|
| 6 | [modal v] [be] used for this purpose | 13 |
|
| 7 | [modal v] [be] used for this purpose | 13 |
|
| 8 | can [be] used for [adj] purpose | 5 |
|
| 9 | can [be] used for [adj] purpose | 5 |
|
