SN4 ""

No	Pattern	Freq
1	[conj] it [be] often [verb]	93
2	[subord] it [be] often [verb]	48
3	[coord] it [be] often [verb]	35
4	[noun] it [be] often [verb]	26
5	as it [be] often [verb]	24
6	as it [be] often [verb]	24
7	[noun sg] it [be] often [verb]	23
8	and it [be] often [verb]	21
9	and it [be] often [verb]	21
10	but it [be] often [verb]	14
11	but it [be] often [verb]	14
12	[adv] it [be] often [verb]	11
13	[that] it [be] often [verb]	10
14	that it [be] often [verb]	10
15	that it [be] often [verb]	10
16	[verb] it [be] often [verb]	8
17	although it [be] often [verb]	7
18	although it [be] often [verb]	7
19	[adv] it [be] often [verb]	7
20	because it [be] often [verb]	6
21	because it [be] often [verb]	6
22	it [be] [adv] often [verb]	45
23	it [be] [adv] often [verb]	37
24	it [be] more often [verb]	8
25	it [be] [not/n't] often [verb]	8
26	it [be] more often [verb]	8
27	it [be] not often [verb]	8
28	it [be] not often [verb]	8
29	it [be] most often [verb]	7
30	it [be] so often [verb]	7