SN4 ""

No	Pattern	Freq
1	[noun] is [conj] it [verb]	755
2	[noun] is that it [verb]	721
3	[noun] is that it [verb]	721
4	[noun] is [that] it [verb]	721
5	[noun] is [conj] it [vb -s]	709
6	[noun sg] is [conj] it [verb]	680
7	[noun] is [conj] it have	87
8	[noun] is [conj] it has	76
9	[noun] is [conj] it do	71
10	[noun] is [conj] it does	65
11	[noun] is [conj] it [vb past]	45
12	[noun pl] is [conj] it [verb]	45
13	[noun] is [subord] it [verb]	32
14	approach is [conj] it [verb]	28
15	approach is [conj] it [verb]	28
16	[noun] is [conj] it make	27
17	[noun] is [conj] it allows	25
18	[noun] is [conj] it allow	25
19	[noun] is [conj] it provide	25
20	[noun] is [conj] it provides	25
21	[noun] is [conj] it makes	25
22	[noun prp] is [conj] it [verb]	25
23	theory is [conj] it [verb]	21
24	theory is [conj] it [verb]	21
25	[noun] is whether it [verb]	16
26	[noun] is [conj] it seem	16
27	system is [conj] it [verb]	16
28	[noun] is [conj] it give	16
29	[noun] is whether it [verb]	16
30	system is [conj] it [verb]	16