SN4 ""

No	Pattern	Freq
1	[conj] it is [adj] for	527
2	[conj] it is [adj] for	527
3	that it is [adj] for	208
4	that it is [adj] for	208
5	[that] it is [adj] for	208
6	[subord] it is [adj] for	175
7	[coord] it is [adj] for	144
8	and it is [adj] for	82
9	and it is [adj] for	82
10	[conj] it is possible for	60
11	but it is [adj] for	59
12	but it is [adj] for	59
13	[conj] it is difficult for	44
14	[conj] it is important for	38
15	if it is [adj] for	33
16	if it is [adj] for	33
17	[conj] it is necessary for	30
18	[conj] it is impossible for	27
19	because it is [adj] for	24
20	because it is [adj] for	24
21	so it is [adj] for	20
22	so it is [adj] for	20
23	as it is [adj] for	20
24	as it is [adj] for	20
25	[conj] it is good for	18
26	[conj] it is essential for	18
27	whether it is [adj] for	17
28	whether it is [adj] for	17
29	[conj] it is unusual for	16
30	[conj] it is responsible for	13