SN4 ""

No	Pattern	Freq
1	it [is] often [vb pp] [conj]	168
2	it [is] often [verb] [conj]	168
3	it is often [verb] [conj]	163
4	it [is] often [verb] that	154
5	it [is] often [verb] [that]	154
6	it [is] often [verb] that	154
7	it [is] often say [conj]	49
8	it [is] often said [conj]	49
9	it [is] often assume [conj]	25
10	it [is] often assumed [conj]	25
11	it [is] often argued [conj]	16
12	it [is] often argue [conj]	16
13	it [is] often claimed [conj]	12
14	it [is] often [verb] [subord]	12
15	it [is] often claim [conj]	12
16	it [is] often [verb] as	10
17	it [is] often [verb] as	10
18	it [is] often suggested [conj]	8
19	it [is] often suggest [conj]	8
20	it [is] often forget [conj]	7
21	it [is] often forgotten [conj]	7
22	it [is] often find [conj]	5
23	it [is] often think [conj]	5
24	it [is] often thought [conj]	5
25	it 's often [verb] [conj]	5
26	it [is] often found [conj]	5