SN4 ""

No	Pattern	Freq
1	[vb mod] have been [verb] for	286
2	[modal v] have been [verb] for	286
3	would have been [verb] for	73
4	would have been [verb] for	70
5	could have been [verb] for	67
6	could have been [verb] for	67
7	[adv] have been [verb] for	61
8	[adv] have been [verb] for	46
9	might have been [verb] for	37
10	might have been [verb] for	37
11	must have been [verb] for	36
12	must have been [verb] for	36
13	may have been [verb] for	30
14	may have been [verb] for	30
15	should have been [verb] for	26
16	should have been [verb] for	26
17	will have been [verb] for	17
18	will have been [verb] for	16
19	[not/n't] have been [verb] for	15
20	not have been [verb] for	15
21	not have been [verb] for	11
22	well have been [verb] for	6
23	well have been [verb] for	6
24	also have been [verb] for	5
25	also have been [verb] for	5
26	have [adv] been [verb] for	6
27	have [adv] been [verb] for	6
28	have been [adv] [verb] for	12
29	have been [adv] [verb] for	12
30	have been [adj] [verb] for	11