| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do we need [verb] | 11 |
|
| 2 | why do we need [to-vb] | 9 |
|
| 3 | why do we need [adj] | 7 |
|
| 4 | why do we need [noun] | 5 |
|
| 5 | why do we need [noun sg] | 5 |
|
