| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it 's [adj] have | 224 |
|
| 2 | it [be] useful have | 25 |
|
| 3 | it be useful have | 25 |
|
| 4 | it [is] useful have | 24 |
|
| 5 | it 's useful [verb] | 13 |
|
| 6 | [pers pn] 's useful have | 6 |
|
| 7 | it 's useful have | 6 |
|
| 8 | [pron] 's useful have | 6 |
|
