SN4 ""

No	Pattern	Freq
1	[conj] it have [been] for	41
2	[subord] it have [been] for	38
3	as it have [been] for	19
4	as it have [been] for	19
5	than it have [been] for	18
6	than it have [been] for	18
7	[noun] it have [been] for	10
8	[adj] it have [been] for	10
9	[noun sg] it have [been] for	10
10	[adv] it have [been] for	7
11	[adj] it have [been] for	7
12	way it have [been] for	6
13	way it have [been] for	6
14	[Wh det] it have [been] for	5
15	[pron] it have [been] for	5
16	it [modal v] have [been] for	14
17	it [vb mod] have [been] for	14
18	it must have [been] for	6
19	it must have [been] for	6
20	it have [adv] [been] for	183
21	it have not [been] for	178
22	it have [not/n't] [been] for	178
23	it have n't [been] for	116
24	it have not [been] for	62
25	it have [adv] [been] for	5
26	it have [been] [verb] for	222
27	it have [been] [vb pp] for	172
28	it have [been] [adj] for	121
29	it have [been] [adj] for	115
30	it have [been] [v-ing] for	50