SN4 ""

No	Pattern	Freq
31	it [modal v] [adv] have been [prep]	11
32	it [modal v] n't have been [prep]	8
33	it [modal v] not have been [prep]	7
34	it [modal v] have been [adj] [prep]	248
35	it [modal v] have been [verb] [prep]	237
36	it [modal v] have been [vb pp] [prep]	222
37	it [modal v] have been [adj] [prep]	194
38	it [modal v] have been [adv] [prep]	34
39	it [modal v] have been [adj -er] [prep]	33
40	it [modal v] have been [adv] [prep]	30
41	it [modal v] have been good [prep]	29
42	it [modal v] have been [noun] [prep]	24
43	it [modal v] have been better [prep]	23
44	it [modal v] have been difficult [prep]	20
45	it [modal v] have been difficult [prep]	20
46	it [modal v] have been [pron] [prep]	19
47	it [modal v] have been [indef pn] [prep]	18
48	it [modal v] have been possible [prep]	17
49	it [modal v] have been possible [prep]	17
50	it [modal v] have been [noun sg] [prep]	17
51	it [modal v] have been easy [prep]	16
52	it [modal v] have been [num] [prep]	16
53	it [modal v] have been [v-ing] [prep]	14
54	it [modal v] have been one [prep]	14
55	it [modal v] have been easy [prep]	14
56	it [modal v] have been one [prep]	14
57	it [modal v] have been impossible [prep]	10
58	it [modal v] have been write [prep]	10
59	it [modal v] have been done [prep]	10
60	it [modal v] have been [prep] [prep]	10