SN4 ""

No	Pattern	Freq
1	it have [adv] been	2100
2	it has [adv] been	1188
3	it had [adv] been	586
4	it have always been	337
5	it 's [adv] been	319
6	it have also been	234
7	it have never been	189
8	it have already been	167
9	it have long been	138
10	it have all been	132
11	it have now been	82
12	it have ever been	75
13	it have often been	74
14	it have only been	73
15	it have just been	72
16	it have recently been	48
17	it have even been	36
18	it have once been	34
19	it have previously been	33
20	it have sometimes been	27
21	it have since been	26
22	it have probably been	25
23	it have certainly been	23
24	it have originally been	20
25	it have actually been	16
26	it have obviously been	12
27	it have indeed been	12
28	it have therefore been	11
29	it have frequently been	10
30	it have really been	10