SN4 ""

No	Pattern	Freq
1	has been [vb pp] [prep] some	201
2	have been [vb pp] by some	145
3	have been [vb pp] in some	119
4	had been [vb pp] [prep] some	105
5	have been [vb pp] for some	101
6	have been [vb pp] [prep] some	86
7	have been [vb pp] [prep] some	41
8	have been [vb pp] to some	32
9	have been [vb pp] with some	28
10	have been [vb pp] at some	22
11	have been known [prep] some	21
12	to have been [vb pp] [prep] some	17
13	have been used [prep] some	15
14	have been found [prep] some	9
15	's been [vb pp] [prep] some	7
16	have been seen [prep] some	7
17	have been recognised [prep] some	7
18	have been established [prep] some	7
19	have been made [prep] some	7
20	have been suggested [prep] some	6
21	have been described [prep] some	6
22	've been [vb pp] [prep] some	5
23	have been expressed [prep] some	5
24	have been argued [prep] some	5
25	having been [vb pp] [prep] some	5
26	have been adopted [prep] some	5