SN4 ""

No	Pattern	Freq
1	[noun sg] is [conj] it [verb]	680
2	[noun sg] is that it [verb]	648
3	[noun sg] is [that] it [verb]	648
4	[noun sg] is that it [verb]	648
5	[noun sg] is [conj] it [vb -s]	640
6	[noun sg] is [conj] it have	76
7	[noun sg] is [conj] it has	65
8	[noun sg] is [conj] it do	58
9	[noun sg] is [conj] it does	54
10	[noun sg] is [conj] it [vb past]	39
11	[noun sg] is [subord] it [verb]	30
12	approach is [conj] it [verb]	28
13	[noun sg] is [conj] it make	26
14	[noun sg] is [conj] it allow	25
15	[noun sg] is [conj] it allows	25
16	[noun sg] is [conj] it makes	24
17	[noun sg] is [conj] it provide	23
18	[noun sg] is [conj] it provides	23
19	theory is [conj] it [verb]	21
20	system is [conj] it [verb]	16
21	[noun sg] is whether it [verb]	16
22	[noun sg] is whether it [verb]	16
23	[noun sg] is [conj] it seem	15
24	[noun sg] is [conj] it give	14
25	[noun sg] is [conj] it seems	14
26	[noun sg] is [conj] it gives	13
27	answer is [conj] it [verb]	13
28	method is [conj] it [verb]	10
29	[noun sg] is [conj] it require	10
30	[noun sg] is [conj] it offer	10