| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to be useful [prep] | 48 |
|
| 2 | to [be] useful [prep] | 48 |
|
| 3 | to [be] useful [prep] | 48 |
|
| 4 | to be useful [prep] | 48 |
|
| 5 | to [be] useful in | 20 |
|
| 6 | to [be] useful in | 20 |
|
| 7 | to [be] useful to | 14 |
|
| 8 | to [be] useful to | 14 |
|
| 9 | to [be] useful for | 8 |
|
| 10 | to [be] useful for | 8 |
|
