SN4 ""

No	Pattern	Freq
1	it is [adv] [adj] that this	59
2	it is also [adj] that [det]	45
3	it is [adv] [adj] that some	43
4	it is [adv] [adj] that many	42
5	it is [adv] true that [det]	36
6	it is [adv] [adj] that any	32
7	it is [adv] possible that [det]	31
8	it is [adv] likely that [det]	29
9	it is [adv] unlikely that [det]	29
10	it is [adv] clear that [det]	29
11	it is [adv] [adj] that these	24
12	it is [adv] [adj] that such	21
13	it is [adv] important that [det]	20
14	it is very [adj] that [det]	19
15	it is quite [adj] that [det]	18
16	it is hardly [adj] that [det]	17
17	it is [adv] surprising that [det]	16
18	it is [adv] [adj] that all	16
19	it is highly [adj] that [det]	15
20	it is most [adj] that [det]	14
21	it is [adv] [adj] that those	14
22	it is [adv] [adj] that most	12
23	it is now [adj] that [det]	12
24	it is [adv] essential that [det]	11
25	it is particularly [adj] that [det]	10
26	it is therefore [adj] that [det]	10
27	it is absolutely [adj] that [det]	9
28	it is [adv] [adj] that both	9
29	it is certainly [adj] that [det]	9
30	it is perhaps [adj] that [det]	8