| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which be [adj] for | 729 |
|
| 2 | [pron] be essential for | 142 |
|
| 3 | which be essential [prep] | 86 |
|
| 4 | [Wh det] be essential for | 41 |
|
| 5 | which [be] essential for | 39 |
|
| 6 | which be essential for | 39 |
|
