SN4 ""

No	Pattern	Freq
31	it is [adv] recognised [conj]	49
32	it is [adv] agree [conj]	43
33	it is [adv] agreed [conj]	42
34	it is [adv] establish [conj]	39
35	it is [adv] [verb] as	39
36	it is [adv] [verb] as	39
37	it is [adv] established [conj]	39
38	it is [adv] think [conj]	36
39	it is [adv] thought [conj]	36
40	it is commonly [verb] [conj]	31
41	it is [adv] recommended [conj]	30
42	it is [adv] recommend [conj]	30
43	it is strongly [verb] [conj]	29
44	it is [adv] claim [conj]	27
45	it is [adv] [v-ing] [conj]	27
46	it is [adv] claimed [conj]	27
47	it is usually [verb] [conj]	26
48	it is therefore [verb] [conj]	24
49	it is [adv] recognize [conj]	22
50	it is [adv] recognized [conj]	22
51	it is further [verb] [conj]	17
52	it is frequently [verb] [conj]	16
53	it is [adv] found [conj]	16
54	it is [adv] [verb] or	16
55	it is [adv] find [conj]	16
56	it is [adv] [verb] or	16
57	it is [adv] [vb base] [conj]	15
58	it is [adv] acknowledged [conj]	15
59	it is [adv] state [conj]	15
60	it is [adv] acknowledge [conj]	15