| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] is for [v-ing] | 47 |
|
| 2 | [noun sg] is useful for | 41 |
|
| 3 | is useful for [v-ing] | 39 |
|
| 4 | [noun sg] useful for [v-ing] | 16 |
|
