| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is a [adj] | 35549 |
|
| 2 | be a useful | 594 |
|
| 3 | [be] a useful | 594 |
|
| 4 | [is] a useful | 309 |
|
| 5 | is [art] useful | 291 |
|
| 6 | is [art] useful | 291 |
|
| 7 | is a useful | 289 |
|
