SN4 ""

No	Pattern	Freq
1	[modal v] not have been [det] [noun]	32
2	[vb mod] not have been [det] [noun]	32
3	would not have been [det] [noun]	18
4	would not have been [det] [noun]	18
5	could not have been [det] [noun]	6
6	could not have been [det] [noun]	6
7	not [vb infin] have been [det] [noun]	6
8	not [verb] have been [det] [noun]	6
9	not have been [verb] [det] [noun]	7
10	not have been [prep] [det] [noun]	6
11	not have been [prep] [det] [noun]	6
12	not have been [v-ing] [det] [noun]	5
13	not have been [det] [adj] [noun]	7
14	not have been [det] [adj] [noun]	7
15	not have been [det] [art] [noun]	6
16	not have been [det] [art] [noun]	6
17	not have been [det] a [noun]	5
18	not have been [det] a [noun]	5
19	not have been [det] [noun] [prep]	13
20	not have been [det] [noun] [prep]	13
21	not have been [det] [noun] [conj]	7
22	not have been [det] [noun] [subord]	5