| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [vb pp] [adv] [conj] | 6935 |
|
| 2 | [be] [vb pp] [adv] to maintain | 9 |
|
| 3 | [vb pp] [adv] [conj] to maintain | 7 |
|
