SN4 ""

No	Pattern	Freq
1	[conj] it have been [vb pp] for	51
2	[subord] it have been [vb pp] for	33
3	[adv] it have been [vb pp] for	12
4	if it have been [vb pp] for	10
5	if it have been [vb pp] for	10
6	[that] it have been [vb pp] for	9
7	that it have been [vb pp] for	9
8	[coord] it have been [vb pp] for	9
9	[noun] it have been [vb pp] for	9
10	that it have been [vb pp] for	9
11	as it have been [vb pp] for	7
12	as it have been [vb pp] for	7
13	[Wh adv] it have been [vb pp] for	6
14	but it have been [vb pp] for	6
15	[verb] it have been [vb pp] for	6
16	[adv] it have been [vb pp] for	6
17	but it have been [vb pp] for	6
18	[noun sg] it have been [vb pp] for	5
19	it [vb mod] have been [vb pp] for	15
20	it [modal v] have been [vb pp] for	15
21	it have [adv] been [vb pp] for	43
22	it have [adv] been [vb pp] for	29
23	it have [not/n't] been [vb pp] for	14
24	it have not been [vb pp] for	14
25	it have not been [vb pp] for	10
26	it have been [adv] [vb pp] for	16
27	it have been [adv] [vb pp] for	16
28	it have been [vb pp] [adv] for	29
29	it have been [vb pp] [adv prt] for	16
30	it have been [vb pp] [adv] for	13