| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [is] for [v-ing] | 51 |
|
| 2 | [noun sg] [is] useful for | 41 |
|
| 3 | [is] useful for [v-ing] | 40 |
|
| 4 | [noun sg] useful for [v-ing] | 16 |
|
