| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] [pron] is for | 169 |
|
| 2 | [pron] is necessary for | 133 |
|
| 3 | [subord] [pron] is necessary | 131 |
|
| 4 | [subord] is necessary for | 11 |
|
