SN4 ""

No	Pattern	Freq
1	it is [adj] [verb] that	1774
2	it is [adj] [to-vb] that	1770
3	it is [adj] note that	309
4	it is [adj] to note that	308
5	it is [adj] to say that	189
6	it is [adj] say that	189
7	it is [adj] [noun] that	144
8	it is [adj] to remember that	131
9	it is [adj] remember that	131
10	it is [adj] [noun sg] that	122
11	it is [adj] assume that	111
12	it is [adj] to assume that	110
13	it is [adj] to believe that	108
14	it is [adj] believe that	108
15	it is [adj] [adv] that	88
16	it is [adj] [adv] that	83
17	it is [adj] see that	72
18	it is [adj] to see that	72
19	it is [adj] ensure that	56
20	it is [adj] to ensure that	56
21	it is [adj] to realise that	52
22	it is [adj] realise that	52
23	it is [adj] know that	46
24	it is [adj] to know that	45
25	it is [adj] imagine that	43
26	it is [adj] to imagine that	43
27	it is [adj] suppose that	42
28	it is [adj] to suppose that	42
29	it is [adj] to think that	40
30	it is [adj] think that	40