SN4 ""

No	Pattern	Freq
1	[noun] [conj] it is [adv] for	8
2	[noun sg] [conj] it is [adv] for	7
3	[verb] [conj] it is [adv] for	6
4	[adv] [conj] it is [adv] for	6
5	[adv] [conj] it is [adv] for	6
6	[adj] [conj] it is [adv] for	5
7	[adj] [conj] it is [adv] for	5
8	[conj] it is [adj] [adv] for	20
9	[conj] it is [adj] [adv] for	19
10	[conj] it is [adv] [adv] for	13
11	[conj] it is [verb] [adv] for	9
12	[conj] it is [adv] [adv] for	7
13	[conj] it is not [adv] for	6
14	[conj] it is [not/n't] [adv] for	6
15	[conj] it is [vb pp] [adv] for	6
16	[conj] it is [adv] [adj] for	315
17	[conj] it is [adv] [adj] for	303
18	[conj] it is [adv] [verb] for	43
19	[conj] it is [adv] possible for	36
20	[conj] it is [adv] possible for	36
21	[conj] it is [adv] [vb pp] for	34
22	[conj] it is [adv] difficult for	23
23	[conj] it is [adv] difficult for	23
24	[conj] it is [adv] necessary for	19
25	[conj] it is [adv] necessary for	19
26	[conj] it is [adv] easy for	17
27	[conj] it is [adv] unknown for	15
28	[conj] it is [adv] unknown for	15
29	[conj] it is [adv] uncommon for	13
30	[conj] it is [adv] [adv] for	13