SN4 ""

No	Pattern	Freq
1	it be [adv] [adj] know	107
2	it be [adv] [adj] know	104
3	it be [adv] [adv] know	58
4	it be [adv] [adv] know	52
5	it be [adv] [pron] know	45
6	it be [adv] [pers pn] know	45
7	it be [adv] you know	39
8	it be [adv] you know	39
9	it be [adv] difficult know	23
10	it be [adv] difficult know	23
11	it be [adv] well know	22
12	it be [adv] well know	21
13	it be [adv] important know	21
14	it be [adv] important know	21
15	it be [adv] commonly know	7
16	it be [adv] commonly know	7
17	it be [adv] necessary know	6
18	it be [adv] hard know	6
19	it be [adv] nice know	6
20	it be [adv] necessary know	6
21	it be [adv] nice know	6
22	it be [adv] not know	5
23	it be [adv] [not/n't] know	5
24	it be [adv] impossible know	5
25	it be [adv] hard know	5
26	it be [adv] good know	5
27	it be [adv] not know	5
28	it be [adv] impossible know	5
29	[conj] it be [adv] know	112
30	[subord] it be [adv] know	64