SN4 ""

No	Pattern	Freq
1	have been [adj] for [noun pl]	86
2	had been [adj] for [noun]	63
3	have been [adj] for [noun sg]	55
4	have been [adj] for [noun prp]	53
5	have been [adj] for [noun]	49
6	has been [adj] for [noun]	41
7	have been [adj] for years	25
8	have been [adj] for year	25
9	have been [adj] for [noun]	23
10	have been responsible for [noun]	18
11	have been good for [noun]	12
12	have been dead for [noun]	10
13	's been [adj] for [noun]	10
14	have been necessary for [noun]	8
15	have been [adj] for centuries	8
16	have been available for [noun]	8
17	have been [adj] for century	8
18	have been [adj] for month	7
19	have been [adj] for months	7
20	have been [adj] for hours	7
21	have been [adj] for hour	7
22	have been possible for [noun]	6
23	to have been [adj] for [noun]	5
24	have been [adj] for britain	5
25	have been easy for [noun]	5
26	have been [adj] for britain	5