| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | essential for [adj] [noun] | 142 |
|
| 2 | [am/are] for [adj] [noun] | 128 |
|
| 3 | [am/are] essential for [adj] | 19 |
|
| 4 | [am/are] essential for [noun] | 8 |
|
