SN4 ""

No	Pattern	Freq
1	[subord] it have been for [adj]	12
2	[conj] it have been for [adj]	12
3	as it have been for [adj]	6
4	as it have been for [adj]	6
5	than it have been for [adj]	5
6	than it have been for [adj]	5
7	it have [adv] been for [adj]	13
8	it have [not/n't] been for [adj]	12
9	it have not been for [adj]	12
10	it have n't been for [adj]	7
11	it have not been for [adj]	5
12	it have been [verb] for [adj]	64
13	it have been [vb pp] for [adj]	46
14	it have been [adj] for [adj]	28
15	it have been [adj] for [adj]	25
16	it have been [v-ing] for [adj]	18
17	it have been known for [adj]	14
18	it have been know for [adj]	14
19	it have been [adv] for [adj]	13
20	it have been [adv] for [adj]	8
21	it have been use for [adj]	6
22	it have been used for [adj]	6
23	it have been there for [adj]	5
24	it have been [adv prt] for [adj]	5
25	it have been there for [adj]	5
26	it have been for [art] [adj]	16
27	it have been for [art] [adj]	16
28	it have been for the [adj]	10
29	it have been for the [adj]	10
30	it have been for a [adj]	6