SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] for	840
2	it is very [adj] for	110
3	it is [adv] possible for	99
4	it is [adv] important for	77
5	it is quite [adj] for	76
6	it is [adv] difficult for	75
7	it is also [adj] for	69
8	it is more [adj] for	52
9	it is too [adj] for	42
10	it is [adv] common for	40
11	it is [adv] easy for	35
12	it is [adv] impossible for	34
13	it is particularly [adj] for	29
14	it is therefore [adj] for	29
15	it is [adv] rare for	28
16	it is now [adj] for	27
17	it is [adv] necessary for	26
18	it is often [adj] for	22
19	it is extremely [adj] for	20
20	it is still [adj] for	19
21	it is [adv] useful for	19
22	it is [adv] essential for	18
23	it is most [adj] for	17
24	it is always [adj] for	17
25	it is perfectly [adj] for	16
26	it is [adv] usual for	15
27	it is relatively [adj] for	13
28	it is [adv] late for	13
29	it is [adv] hard for	13
30	it is [adv] suitable for	13