SN4 ""

No	Pattern	Freq
1	it is [adj] that [det] [noun]	506
2	it be [adj] that [det] [noun sg]	279
3	it be [adj] that [det] [noun pl]	271
4	it be [adj] that this [noun]	143
5	it be clear that [det] [noun]	86
6	it be [adj] that some [noun]	83
7	it be likely that [det] [noun]	72
8	it be [adj] that these [noun]	66
9	it be [adj] that such [noun]	61
10	it was [adj] that [det] [noun]	54
11	it be [adj] that all [noun]	51
12	it be possible that [det] [noun]	49
13	it be unlikely that [det] [noun]	47
14	it be [adj] that any [noun]	46
15	it be important that [det] [noun]	45
16	it be true that [det] [noun]	42
17	it be essential that [det] [noun]	40
18	it be [adj] that many [noun]	36
19	it be [adj] that [det] [n mass]	29
20	it 's [adj] that [det] [noun]	24
21	it be [adj] that [det] people	23
22	it be [adj] that [det] people	23
23	it be [adj] that most [noun]	22
24	it be vital that [det] [noun]	17
25	it be probable that [det] [noun]	16
26	it be [adj] that that [noun]	15
27	it be [adj] that both [noun]	13
28	it be [adj] that each [noun]	13
29	it be obvious that [det] [noun]	13
30	it be [adj] that those [noun]	12