SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] for	890
2	it is [adv] [adj] for	840
3	it is very [adj] for	111
4	it is [adv] possible for	99
5	it is [adv] possible for	99
6	it is [adv] important for	77
7	it is [adv] important for	77
8	it is quite [adj] for	76
9	it is [adv] difficult for	75
10	it is [adv] difficult for	75
11	it is also [adj] for	70
12	it is [adv] easy for	53
13	it is more [adj] for	52
14	it is too [adj] for	46
15	it is [adv] common for	40
16	it is [adv] common for	40
17	it is [adv] [adj -er] for	38
18	it is [adv] easy for	35
19	it is [adv] impossible for	34
20	it is [adv] impossible for	34
21	it is therefore [adj] for	31
22	it is particularly [adj] for	29
23	it is [adv] rare for	29
24	it is [adv] rare for	28
25	it is now [adj] for	28
26	it is [adv] necessary for	26
27	it is [adv] necessary for	26
28	it is often [adj] for	24
29	it is [adv] good for	23
30	it is extremely [adj] for	20