SN4 ""

No	Pattern	Freq
1	[vb mod] have been [prep] [det] [noun]	53
2	[modal v] have been [prep] [det] [noun]	53
3	[adv] have been [prep] [det] [noun]	22
4	must have been [prep] [det] [noun]	16
5	[adv] have been [prep] [det] [noun]	16
6	must have been [prep] [det] [noun]	16
7	could have been [prep] [det] [noun]	11
8	would have been [prep] [det] [noun]	11
9	could have been [prep] [det] [noun]	11
10	would have been [prep] [det] [noun]	10
11	may have been [prep] [det] [noun]	7
12	may have been [prep] [det] [noun]	7
13	well have been [prep] [det] [noun]	6
14	not have been [prep] [det] [noun]	6
15	[not/n't] have been [prep] [det] [noun]	6
16	well have been [prep] [det] [noun]	6
17	have been [verb] [prep] [det] [noun]	178
18	have been [vb pp] [prep] [det] [noun]	159
19	have been [adj] [prep] [det] [noun]	89
20	have been [adj] [prep] [det] [noun]	78
21	have been [v-ing] [prep] [det] [noun]	18
22	have been [adv] [prep] [det] [noun]	11
23	have been [adv prt] [prep] [det] [noun]	8
24	have been [num] [prep] [det] [noun]	6
25	have been one [prep] [det] [noun]	6
26	have been make [prep] [det] [noun]	6
27	have been one [prep] [det] [noun]	6
28	have been made [prep] [det] [noun]	6
29	have been [noun] [prep] [det] [noun]	5
30	have been possible [prep] [det] [noun]	5