SN4 ""

No	Pattern	Freq
1	[pron] it is that [pron] [vb base]	30
2	[Wh det] it is that [pron] [vb base]	30
3	what it is that [pron] [vb base]	19
4	what it is that [pron] [vb base]	19
5	[adv] it is that [pron] [vb base]	12
6	whatever it is that [pron] [vb base]	11
7	whatever it is that [pron] [vb base]	11
8	[Wh adv] it is that [pron] [vb base]	10
9	[prep] it is that [pron] [vb base]	8
10	[prep] it is that [pron] [vb base]	8
11	how it is that [pron] [vb base]	5
12	how it is that [pron] [vb base]	5
13	it is [adj] that [pron] [vb base]	326
14	it is [adj] that [pron] [vb base]	317
15	it is important that [pron] [vb base]	103
16	it is important that [pron] [vb base]	103
17	it is [adv] that [pron] [vb base]	61
18	it is [verb] that [pron] [vb base]	55
19	it is [vb pp] that [pron] [vb base]	53
20	it is essential that [pron] [vb base]	48
21	it is essential that [pron] [vb base]	48
22	it is [adv] that [pron] [vb base]	47
23	it is vital that [pron] [vb base]	36
24	it is vital that [pron] [vb base]	36
25	it is clear that [pron] [vb base]	19
26	it is clear that [pron] [vb base]	19
27	it is true that [pron] [vb base]	16
28	it is true that [pron] [vb base]	16
29	it is not that [pron] [vb base]	14
30	it is [not/n't] that [pron] [vb base]	14