SN4 ""

No	Pattern	Freq
1	it be often [verb]	437
2	it [be] often [verb]	437
3	it [be] often [vb pp]	434
4	it [is] often [verb]	386
5	it is often [verb]	364
6	it [be] often said	71
7	it [be] often say	71
8	it [was/were] often [verb]	51
9	it was often [verb]	51
10	it [be] often assume	29
11	it [be] often assumed	29
12	it [be] often argued	25
13	it [be] often argue	25
14	it 's often [verb]	22
15	it [be] often used	22
16	it [be] often use	22
17	it [be] often call	19
18	it [be] often called	19
19	it [be] often claimed	14
20	it [be] often claim	14
21	it [be] often forget	13
22	it [be] often forgotten	13
23	it [be] often thought	11
24	it [be] often suggest	11
25	it [be] often referred	11
26	it [be] often think	11
27	it [be] often refer	11
28	it [be] often suggested	11
29	it [be] often found	9
30	it [be] often find	9