SN4 ""

No	Pattern	Freq
1	[conj] it be refer to	17
2	[that] it be refer to	8
3	that it be refer to	8
4	that it be refer to	8
5	[adv] it be refer to	7
6	[subord] it be refer to	6
7	[noun] it be refer to	5
8	it [modal v] be refer to	12
9	it [vb mod] be refer to	12
10	it have be refer to	7
11	it [verb] be refer to	7
12	it [vb -s] be refer to	6
13	it has be refer to	5
14	it be [adv] refer to	48
15	it be [adv] refer to	48
16	it be [adj] refer to	27
17	it be [adj] refer to	27
18	it be often refer to	11
19	it be sometimes refer to	11
20	it be often refer to	11
21	it be sometimes refer to	11
22	it be necessary refer to	8
23	it be necessary refer to	8
24	it be [verb] refer to	6
25	it be [vb pp] refer to	5
26	it be usually refer to	5
27	it be usually refer to	5
28	it be refer to [prep]	17
29	it be refer to [prep]	17
30	it be refer to [art]	16