SN4 ""

No	Pattern	Freq
1	it have been [vb pp] [prep]	1838
2	it has been [verb] [prep]	981
3	it had been [verb] [prep]	707
4	it have been [verb] by	484
5	it have been [verb] in	309
6	it 's been [verb] [prep]	261
7	it have been [verb] to	230
8	it have been [verb] for	222
9	it have been [v-ing] [prep]	131
10	it have been [verb] as	109
11	it have been [verb] with	108
12	it have been [verb] on	102
13	it have been [verb] from	82
14	it have been [verb] at	77
15	it have been [verb] into	68
16	it have been use [prep]	57
17	it have been used [prep]	57
18	it have been know [prep]	49
19	it have been suggest [prep]	49
20	it have been known [prep]	49
21	it have been suggested [prep]	47
22	it have been show [prep]	34
23	it have been shown [prep]	34
24	it have been make [prep]	32
25	it have been made [prep]	32
26	it have been [verb] of	30
27	it have been do [prep]	29
28	it have been done [prep]	26
29	it have been record [prep]	24
30	it have been leave [prep]	23