SN4 ""

No	Pattern	Freq
1	have been [vb pp] at [adj] [noun]	82
2	have been [verb] at [adj] [noun pl]	55
3	have been [verb] at [adj] [noun sg]	38
4	has been [verb] at [adj] [noun]	33
5	have been [verb] at [adj] [noun]	26
6	had been [verb] at [adj] [noun]	20
7	have been [verb] at [adj] time	12
8	have been [verb] at various [noun]	12
9	have been [verb] at [adj] times	12
10	have been [v-ing] at [adj] [noun]	12
11	have been [verb] at [adj] [noun]	11
12	have been [verb] at different [noun]	10
13	have been [verb] at [adj] level	9
14	have been [verb] at [adj] intervals	8
15	have been [verb] at [adj] interval	8
16	have been [verb] at [adj] level	6
17	have been [verb] at [adj] point	5
18	have been [verb] at [adj] points	5
19	have been [verb] at high [noun]	5
20	have been [verb] at [adj] expense	5
21	have been [verb] at [adj] expense	5