SN4 ""

No	Pattern	Freq
1	[conj] it [modal v] have been [prep]	65
2	[subord] it [modal v] have been [prep]	37
3	[pron] it [modal v] have been [prep]	26
4	[Wh det] it [modal v] have been [prep]	22
5	what it [modal v] have been [prep]	20
6	what it [modal v] have been [prep]	20
7	[coord] it [modal v] have been [prep]	19
8	as it [modal v] have been [prep]	19
9	as it [modal v] have been [prep]	19
10	[adv] it [modal v] have been [prep]	15
11	[noun] it [modal v] have been [prep]	15
12	than it [modal v] have been [prep]	13
13	[verb] it [modal v] have been [prep]	13
14	than it [modal v] have been [prep]	13
15	[adv] it [modal v] have been [prep]	12
16	but it [modal v] have been [prep]	11
17	but it [modal v] have been [prep]	11
18	[noun sg] it [modal v] have been [prep]	9
19	that it [modal v] have been [prep]	9
20	[that] it [modal v] have been [prep]	9
21	that it [modal v] have been [prep]	9
22	and it [modal v] have been [prep]	7
23	and it [modal v] have been [prep]	7
24	[adj] it [modal v] have been [prep]	6
25	[adj] it [modal v] have been [prep]	6
26	[vb base] it [modal v] have been [prep]	5
27	say it [modal v] have been [prep]	5
28	it [modal v] [adv] have been [prep]	26
29	it [modal v] not have been [prep]	15
30	it [modal v] [not/n't] have been [prep]	15