| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what [pron] is for | 12 |
|
| 2 | [prep] what [pers pn] is for | 12 |
|
| 3 | [prep] what it is for | 12 |
|
| 4 | [prep] what it is for | 12 |
|
| 5 | [prep] what is [adj] for | 41 |
|
| 6 | [prep] what is [adj] for | 24 |
|
| 7 | [prep] what is good for | 19 |
|
| 8 | [prep] what is [adj -est] for | 17 |
|
| 9 | [prep] what is best for | 16 |
|
| 10 | [prep] what is [verb] for | 14 |
|
| 11 | [prep] what is [vb pp] for | 14 |
|
