SN4 ""

No	Pattern	Freq
1	[vb mod] have [been] for	62
2	[modal v] have [been] for	62
3	would have [been] for	22
4	would have [been] for	22
5	must have [been] for	14
6	must have [been] for	14
7	may have [been] for	10
8	may have [been] for	10
9	[adv] have [been] for	8
10	might have [been] for	7
11	might have [been] for	7
12	[not/n't] have [been] for	6
13	not have [been] for	6
14	have [been] [verb] for	350
15	have [been] [adj] for	336
16	have [been] [adj] for	297
17	have [been] [vb pp] for	285
18	have [been] [v-ing] for	64
19	have [been] responsible for	48
20	have [been] responsible for	48
21	have [been] [adj -er] for	37
22	have [been] good for	35
23	have [been] [adv] for	29
24	have [been] forgiven for	27
25	have [been] forgive for	27
26	have [been] easy for	27
27	have [been] possible for	26
28	have [been] possible for	26
29	have [been] [noun] for	25
30	have [been] [adv] for	25