SN4 ""

No	Pattern	Freq
1	have been [vb pp] [prep] [noun] at	102
2	have been [verb] [prep] [noun sg] at	52
3	has been [verb] [prep] [noun] at	39
4	have been [verb] by [noun] at	38
5	have been [verb] [prep] [noun pl] at	37
6	had been [verb] [prep] [noun] at	36
7	have been [verb] [prep] [noun] at	24
8	have been [verb] [prep] [noun prp] at	21
9	have been [verb] in [noun] at	18
10	have been [verb] for [noun] at	17
11	have been [verb] to [noun] at	16
12	have been [v-ing] [prep] [noun] at	15
13	have been [verb] [prep] [n mass] at	7
14	have been [verb] on [noun] at	7
15	have been [verb] into [noun] at	6
16	have been [verb] [prep] staff at	6
17	to have been [verb] [prep] [noun] at	6
18	have been [verb] [prep] staff at	6
19	have been [verb] [prep] [noun] at	5
20	have been make [prep] [noun] at	5
21	have been made [prep] [noun] at	5