| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] [pron] | 7601 |
|
| 2 | [adv] maintain [pron] | 151 |
|
| 3 | [modal v] [adv] maintain | 105 |
|
| 4 | [modal v] maintain [pron] | 80 |
|
