SN4 ""

No	Pattern	Freq
1	[conj] it have [been] in the	50
2	[subord] it have [been] in the	46
3	than it have [been] in the	25
4	than it have [been] in the	25
5	as it have [been] in the	14
6	as it have [been] in the	14
7	[pron] it have [been] in the	5
8	[Wh det] it have [been] in the	5
9	it [vb mod] have [been] in the	26
10	it [modal v] have [been] in the	26
11	it must have [been] in the	7
12	it must have [been] in the	7
13	it would have [been] in the	5
14	it would have [been] in the	5
15	it have [adv] [been] in the	19
16	it have [adv] [been] in the	13
17	it have [not/n't] [been] in the	6
18	it have not [been] in the	6
19	it have not [been] in the	5
20	it have [been] [verb] in the	89
21	it have [been] [vb pp] in the	87
22	it have [been] [adj] in the	12
23	it have [been] [adj] in the	8
24	it have [been] found in the	5
25	it have [been] find in the	5
26	it have [been] in the [noun]	61
27	it have [been] in the [noun sg]	52
28	it have [been] in the [adj]	26
29	it have [been] in the [adj]	13
30	it have [been] in the past	12