SN4 ""

No	Pattern	Freq
1	it is [adv] [verb] that [pers pn]	102
2	it is [adv] [vb pp] that [pers pn]	98
3	it is [adv] [verb] that it	43
4	it is [adv] [verb] that they	25
5	it is now [verb] that [pers pn]	16
6	it is [adv] known that [pers pn]	13
7	it is [adv] know that [pers pn]	13
8	it is often [verb] that [pers pn]	12
9	it is [adv] [verb] that you	11
10	it is [adv] [verb] that he	11
11	it is [adv] think that [pers pn]	10
12	it is [adv] thought that [pers pn]	10
13	it is well [verb] that [pers pn]	10
14	it is generally [verb] that [pers pn]	9
15	it is [adv] assume that [pers pn]	9
16	it is [adv] assumed that [pers pn]	9
17	it is [adv] [verb] that we	8
18	it is [adv] say that [pers pn]	8
19	it is [adv] said that [pers pn]	8
20	it is [adv] recommended that [pers pn]	7
21	it is also [verb] that [pers pn]	7
22	it is [adv] argue that [pers pn]	7
23	it is [adv] recommend that [pers pn]	7
24	it is [adv] argued that [pers pn]	7
25	it is strongly [verb] that [pers pn]	6
26	it is [adv] suggest that [pers pn]	6
27	it is [adv] accepted that [pers pn]	6
28	it is [adv] suggested that [pers pn]	6
29	it is [adv] accept that [pers pn]	6