SN4 ""

No	Pattern	Freq
1	[noun] [conj] it is often	42
2	[noun sg] [conj] it is often	34
3	[verb] [conj] it is often	21
4	[adv] [conj] it is often	14
5	[is] [conj] it is often	12
6	[be] [conj] it is often	12
7	is [conj] it is often	12
8	be [conj] it is often	12
9	[adv] [conj] it is often	11
10	[vb pp] [conj] it is often	9
11	[noun pl] [conj] it is often	7
12	[adj] [conj] it is often	7
13	[to-vb] [conj] it is often	5
14	[conj] [conj] it is often	5
15	[vb -s] [conj] it is often	5
16	[conj] [conj] it is often	5
17	[conj] it is [adv] often	27
18	[conj] it is [adv] often	19
19	[conj] it is not often	8
20	[conj] it is [not/n't] often	8
21	[conj] it is not often	8
22	[conj] it is more often	7
23	[conj] it is more often	7
24	[conj] it is often [adj]	87
25	[conj] it is often [verb]	75
26	[conj] it is often [vb pp]	75
27	[conj] it is often [adj]	67
28	[conj] it is often difficult	25
29	[conj] it is often difficult	25
30	[conj] it is often [art]	22