| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] is [to-vb] [conj] maintain | 6 |
|
| 2 | [noun sg] is [to-vb] [conj] maintain | 5 |
|
| 3 | is [adj] [to-vb] [conj] maintain | 6 |
|
| 4 | is [adj] [to-vb] [conj] maintain | 6 |
|
