| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] are essential for the [adj] | 6 |
|
| 2 | which are essential for the [adj] | 5 |
|
| 3 | [Wh det] are essential for the [adj] | 5 |
|
| 4 | which are essential for the [adj] | 5 |
|
| 5 | are essential for the [adj] [noun] | 11 |
|
| 6 | are essential for the [adj] [noun sg] | 10 |
|
