SN4 ""

No	Pattern	Freq
1	[noun] is that it [verb]	721
2	[noun sg] is that it [verb]	648
3	[adj] is that it [verb]	62
4	[noun pl] is that it [verb]	45
5	[verb] is that it [verb]	37
6	[pron] is that it [verb]	36
7	approach is that it [verb]	28
8	approach is that it [verb]	28
9	[pers pn] is that it [verb]	25
10	[noun prp] is that it [verb]	23
11	[det] is that it [verb]	21
12	[adj] is that it [verb]	21
13	it is that it [verb]	20
14	it is that it [verb]	20
15	theory is that it [verb]	19
16	theory is that it [verb]	19
17	system is that it [verb]	15
18	system is that it [verb]	15
19	[adv] is that it [verb]	14
20	answer is that it [verb]	13
21	answer is that it [verb]	13
22	[num ord] is that it [verb]	12
23	[adv] is that it [verb]	11
24	method is that it [verb]	11
25	this is that it [verb]	10
26	this is that it [verb]	10
27	method is that it [verb]	10
28	[vb infin] is that it [verb]	10
29	analysis is that it [verb]	8
30	view is that it [verb]	8