SN4 ""

No	Pattern	Freq
1	it is [adj] [verb] that	1800
2	it is [adj] [verb] that	1775
3	it is [adv] [verb] that	1289
4	it is [adv] [verb] that	1206
5	it is important [verb] that	482
6	it is important [verb] that	482
7	it is [prep] [verb] that	297
8	it is [prep] [verb] that	297
9	it is worth [verb] that	288
10	it is worth [verb] that	288
11	it is interesting [verb] that	183
12	it is interesting [verb] that	183
13	it is generally [verb] that	162
14	it is generally [verb] that	162
15	it is well [verb] that	160
16	it is well [verb] that	160
17	it is often [verb] that	150
18	it is often [verb] that	150
19	it is also [verb] that	110
20	it is also [verb] that	110
21	it is easy [verb] that	104
22	it is easy [verb] that	102
23	it is now [verb] that	102
24	it is now [verb] that	102
25	it is reasonable [verb] that	99
26	it is reasonable [verb] that	99
27	it is difficult [verb] that	97
28	it is difficult [verb] that	97
29	it is sometimes [verb] that	95
30	it is sometimes [verb] that	95