| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it be often [adj] | 86 |
|
| 2 | [conj] it [is] often [adj] | 74 |
|
| 3 | [conj] it is often [adj] | 67 |
|
| 4 | [coord] it [be] often [adj] | 33 |
|
| 5 | [conj] it [be] often difficult | 31 |
|
| 6 | that it [be] often [adj] | 30 |
|
| 7 | that it [be] often [adj] | 30 |
|
| 8 | [that] it [be] often [adj] | 30 |
|
| 9 | [subord] it [be] often [adj] | 23 |
|
| 10 | and it [be] often [adj] | 21 |
|
| 11 | and it [be] often [adj] | 21 |
|
| 12 | [conj] it [was/were] often [adj] | 12 |
|
| 13 | but it [be] often [adj] | 12 |
|
| 14 | [conj] it was often [adj] | 12 |
|
| 15 | but it [be] often [adj] | 12 |
|
| 16 | [conj] it 's often [adj] | 7 |
|
| 17 | [conj] it [be] often necessary | 7 |
|
| 18 | [conj] it [be] often possible | 7 |
|
| 19 | [conj] it [be] often useful | 5 |
|
