SN4 ""

No	Pattern	Freq
31	[vb -s] have been the	100
32	[vb pp] have been the	97
33	who have been the	95
34	[Wh pn] have been the	95
35	who have been the	95
36	might have been the	90
37	might have been the	90
38	there have been the	89
39	[ex0] have been the	89
40	there have been the	89
41	could have been the	86
42	could have been the	86
43	not have been the	84
44	[not/n't] have been the	84
45	what have been the	81
46	what have been the	81
47	year have been the	79
48	seem have been the	79
49	that have been the	69
50	that have been the	69
51	[subord] have been the	69
52	not have been the	67
53	years have been the	66
54	seems have been the	63
55	that have been the	59
56	that have been the	59
57	[that] have been the	59
58	should have been the	55
59	should have been the	55
60	she have been the	51