| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it be often [adj] [verb] | 28 |
|
| 2 | [coord] it [be] often [adj] [to-vb] | 28 |
|
| 3 | [coord] it [be] often [adj] [verb] | 28 |
|
| 4 | [coord] it [is] often [adj] [verb] | 27 |
|
| 5 | [coord] it is often [adj] [verb] | 25 |
|
| 6 | [coord] it [be] often [adj] [verb] | 23 |
|
| 7 | and it [be] often [adj] [verb] | 20 |
|
| 8 | [coord] it [be] often difficult [verb] | 10 |
|
| 9 | [coord] it [be] often difficult [verb] | 10 |
|
| 10 | but it [be] often [adj] [verb] | 8 |
|
| 11 | [coord] it [be] often necessary [verb] | 5 |
|
| 12 | [coord] it [be] often necessary [verb] | 5 |
|
| 13 | [coord] it [be] often [adj -er] [verb] | 5 |
|
