SN4 ""

No	Pattern	Freq
1	[vb mod] have been [adj] for	240
2	[modal v] have been [adj] for	240
3	would have been [adj] for	125
4	would have been [adj] for	123
5	[adv] have been [adj] for	56
6	must have been [adj] for	47
7	must have been [adj] for	47
8	not have been [adj] for	37
9	[not/n't] have been [adj] for	37
10	not have been [adj] for	29
11	may have been [adj] for	28
12	may have been [adj] for	28
13	might have been [adj] for	20
14	might have been [adj] for	20
15	[adv] have been [adj] for	19
16	could have been [adj] for	10
17	could have been [adj] for	10
18	n't have been [adj] for	8
19	should have been [adj] for	7
20	should have been [adj] for	7
21	have been [adv] [adj] for	97
22	have been [adv] [adj] for	97
23	have been very [adj] for	20
24	have been very [adj] for	20
25	have been more [adj] for	12
26	have been more [adj] for	12
27	have been too [adj] for	10
28	have been too [adj] for	10
29	have been [vb pp] [adj] for	6
30	have been [verb] [adj] for	6