No | Pattern | Freq | Relations |
---|---|---|---|
1 | [coord] it [be] [adv] necessary [verb] | 48 | |
2 | [coord] it [be] [adv] necessary [verb] | 36 | |
3 | [coord] it [be] often [adj] [verb] | 28 | |
4 | [coord] it [be] often [adj] [verb] | 23 | |
5 | [conj] it [be] often necessary [verb] | 7 | |
6 | [coord] it [be] often necessary [verb] | 5 | |
7 | [coord] it [be] often necessary [verb] | 5 | |
8 | [coord] [pron] [be] often necessary [verb] | 5 |