| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] [be] essential to | 6 |
|
| 2 | [prep] [noun] [be] essential to | 27 |
|
| 3 | [prep] [noun sg] [be] essential to | 15 |
|
| 4 | [prep] [noun pl] [be] essential to | 7 |
|
| 5 | [prep] [Wh det] [be] essential to | 6 |
|
| 6 | [prep] [pron] [be] essential to | 6 |
|
| 7 | [prep] which [be] essential to | 5 |
|
| 8 | [prep] which [be] essential to | 5 |
|
| 9 | [prep] [be] essential to [pron] | 5 |
|
| 10 | [prep] [be] essential to [pos pn] | 5 |
|
