SN4 ""

No	Pattern	Freq
1	have been [vb pp] in some [noun]	88
2	have been [vb pp] in some [noun pl]	52
3	has been [vb pp] in some [noun]	42
4	have been [vb pp] in some [noun sg]	34
5	have been [vb pp] in some [noun]	20
6	had been [vb pp] in some [noun]	12
7	have been [vb pp] in some way	11
8	have been [vb pp] in some way	11
9	have been [vb pp] in some detail	8
10	have been [vb pp] in some case	8
11	have been [vb pp] in some detail	8
12	have been [vb pp] in some cases	8
13	have been [vb pp] in some quarters	7
14	have been [vb pp] in some quarter	7
15	have been [vb pp] in some study	6
16	have been used in some [noun]	6
17	have been [vb pp] in some [noun]	6
18	have been found in some [noun]	6
19	have been [vb pp] in some studies	6
20	have been [vb pp] in some patients	5
21	have been [vb pp] in some patient	5
22	to have been [vb pp] in some [noun]	5