SN4 ""

No	Pattern	Freq
1	have been [vb pp] [prep] many	262
2	has been [vb pp] [prep] many	140
3	have been [vb pp] by many	77
4	have been [vb pp] [prep] many	70
5	have been [vb pp] for many	67
6	have been [vb pp] in many	58
7	had been [vb pp] [prep] many	37
8	have been used [prep] many	22
9	have been [vb pp] on many	14
10	have been [vb pp] over many	12
11	have been known [prep] many	11
12	have been [vb pp] [prep] many	11
13	have been seen [prep] many	9
14	have been made [prep] many	9
15	have been [vb pp] at many	8
16	have been [vb pp] from many	8
17	have been considered [prep] many	6
18	have been [vb pp] to many	6
19	have been reported [prep] many	5
20	have been established [prep] many	5