SN4 ""

No	Pattern	Freq
1	[modal v] have been [det] [noun]	169
2	[vb mod] have been [det] [noun]	169
3	[adv] have been [det] [noun]	51
4	must have been [det] [noun]	49
5	must have been [det] [noun]	49
6	would have been [det] [noun]	37
7	would have been [det] [noun]	33
8	not have been [det] [noun]	32
9	[not/n't] have been [det] [noun]	32
10	could have been [det] [noun]	29
11	could have been [det] [noun]	29
12	may have been [det] [noun]	21
13	may have been [det] [noun]	21
14	might have been [det] [noun]	20
15	might have been [det] [noun]	20
16	n't have been [det] [noun]	20
17	[adv] have been [det] [noun]	19
18	not have been [det] [noun]	12
19	should have been [det] [noun]	8
20	should have been [det] [noun]	8
21	have been [prep] [det] [noun]	76
22	have been [prep] [det] [noun]	76
23	have been [verb] [det] [noun]	54
24	have been in [det] [noun]	31
25	have been in [det] [noun]	31
26	have been [vb pp] [det] [noun]	30
27	have been [adv] [det] [noun]	28
28	have been [adv] [det] [noun]	25
29	have been [art] [det] [noun]	23
30	have been [art] [det] [noun]	23