| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] be essential for [art] [adj] | 8 |
|
| 2 | [Wh det] be essential for [art] [adj] | 8 |
|
| 3 | [Wh det] be essential for the [adj] | 7 |
|
| 4 | [Wh det] be essential for the [adj] | 7 |
|
| 5 | [Wh det] be essential for [adj] [noun] | 6 |
|
| 6 | [Wh det] be essential for [adj] [noun sg] | 5 |
|
