| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is often [adj] [verb] | 189 |
|
| 2 | it is often [adj] [to-vb] | 187 |
|
| 3 | it is often difficult [verb] | 59 |
|
| 4 | it is often possible [verb] | 39 |
|
| 5 | it is often necessary [verb] | 21 |
|
| 6 | it is often hard [verb] | 11 |
|
| 7 | it is often useful [verb] | 9 |
|
| 8 | it is often impossible [verb] | 8 |
|
| 9 | it is often [adj] to use | 7 |
|
| 10 | it is often [adj] use | 7 |
|
| 11 | it is often [adj] to tell | 6 |
|
| 12 | it is often [adj] tell | 6 |
|
| 13 | it is often [adj] find | 5 |
|
| 14 | it is often [adj] to determine | 5 |
|
| 15 | it is often [adj] to find | 5 |
|
| 16 | it is often [adj] to make | 5 |
|
| 17 | it is often [adj] see | 5 |
|
| 18 | it is often [adj] determine | 5 |
|
| 19 | it is often [adj] make | 5 |
|
| 20 | it is often helpful [verb] | 5 |
|
| 21 | it is often preferable [verb] | 5 |
|
| 22 | it is often [adj] to see | 5 |
|
