| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be essential [prep] | 137 |
|
| 2 | it is essential [prep] | 101 |
|
| 3 | it be essential for | 90 |
|
| 4 | it be essential to | 35 |
|
| 5 | it was essential [prep] | 26 |
|
| 6 | it 's essential [prep] | 10 |
|
| 7 | it be essential in | 6 |
|
