SN4 ""

No	Pattern	Freq
1	have been [vb pp] [prep] some	469
2	has be [vb pp] [prep] some	201
3	have be [vb pp] by some	145
4	have be [vb pp] in some	119
5	had be [vb pp] [prep] some	105
6	have be [vb pp] for some	101
7	have be [vb pp] [prep] some	86
8	have be [vb pp] [prep] some	41
9	have be [vb pp] to some	32
10	have be [vb pp] with some	28
11	have be [vb pp] at some	22
12	have be known [prep] some	21
13	to have be [vb pp] [prep] some	17
14	have be used [prep] some	15
15	have be found [prep] some	9
16	have be made [prep] some	7
17	's be [vb pp] [prep] some	7
18	have be recognised [prep] some	7
19	have be established [prep] some	7
20	have be seen [prep] some	7
21	have be described [prep] some	6
22	have be suggested [prep] some	6
23	having be [vb pp] [prep] some	5
24	have be argued [prep] some	5
25	have be expressed [prep] some	5
26	've be [vb pp] [prep] some	5
27	have be adopted [prep] some	5