| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be essential for [adj] | 77 |
|
| 2 | [is] essential for [adj] | 55 |
|
| 3 | is essential for [adj] | 54 |
|
| 4 | [am/are] essential for [adj] | 12 |
|
| 5 | are essential for [adj] | 12 |
|
| 6 | [be] essential for effective | 7 |
|
| 7 | [be] essential for normal | 6 |
|
| 8 | [was/were] essential for [adj] | 5 |
|
