SN4 ""

No	Pattern	Freq
1	[conj] it is [adv] known [that]	27
2	[coord] it is [adv] known [that]	14
3	[subord] it is [adv] known [that]	11
4	but it is [adv] known [that]	9
5	but it is [adv] known [that]	9
6	[noun] it is [adv] known [that]	6
7	[noun sg] it is [adv] known [that]	5
8	and it is [adv] known [that]	5
9	and it is [adv] known [that]	5
10	it is [adv] [adv] known [that]	17
11	it is [adv] [adv] known [that]	10
12	it is not [adv] known [that]	7
13	it is [not/n't] [adv] known [that]	7
14	it is not [adv] known [that]	7
15	it is [adv] [adv] known [that]	10
16	it is [adv] [adv] known [that]	10
17	it is [adv] well known [that]	9
18	it is [adv] well known [that]	9
19	it is [adv] known [that] [art]	41
20	it is [adv] known [that] [art]	41
21	it is [adv] known [that] [noun]	38
22	it is [adv] known [that] the	35
23	it is [adv] known [that] the	35
24	it is [adv] known [that] [adj]	31
25	it is [adv] known [that] [pron]	19
26	it is [adv] known [that] [noun pl]	18
27	it is [adv] known [that] [det]	16
28	it is [adv] known [that] [pers pn]	13
29	it is [adv] known [that] [noun sg]	13
30	it is [adv] known [that] [adj]	12