SN4 ""

No	Pattern	Freq
1	[conj] it [is] often [verb]	82
2	[subord] it [is] often [verb]	42
3	[coord] it [is] often [verb]	31
4	[noun] it [is] often [verb]	22
5	as it [is] often [verb]	21
6	as it [is] often [verb]	21
7	[noun sg] it [is] often [verb]	20
8	and it [is] often [verb]	19
9	and it [is] often [verb]	19
10	but it [is] often [verb]	12
11	but it [is] often [verb]	12
12	that it [is] often [verb]	9
13	that it [is] often [verb]	9
14	[that] it [is] often [verb]	9
15	[adv] it [is] often [verb]	8
16	although it [is] often [verb]	7
17	although it [is] often [verb]	7
18	[verb] it [is] often [verb]	5
19	because it [is] often [verb]	5
20	because it [is] often [verb]	5
21	it [is] [adv] often [verb]	42
22	it [is] [adv] often [verb]	35
23	it [is] so often [verb]	7
24	it [is] [not/n't] often [verb]	7
25	it [is] so often [verb]	7
26	it [is] not often [verb]	7
27	it [is] more often [verb]	7
28	it [is] not often [verb]	7
29	it [is] most often [verb]	7
30	it [is] most often [verb]	7