| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] if [adj] | 44 |
|
| 2 | is [adj] if [adj] | 40 |
|
| 3 | is essential [conj] [adj] | 35 |
|
| 4 | is essential if [adj] | 10 |
|
| 5 | be essential if [adj] | 8 |
|
| 6 | [be] essential if [adj] | 8 |
|
| 7 | [is] essential if [adj] | 6 |
|
| 8 | is essential if [adj] | 6 |
|
