SN4 ""

No	Pattern	Freq
1	[adv] have been possible	86
2	not have been possible	69
3	[not/n't] have been possible	69
4	not have been possible	66
5	[modal v] have been possible	53
6	[vb mod] have been possible	53
7	would have been possible	32
8	would have been possible	32
9	[adv] have been possible	17
10	might have been possible	12
11	might have been possible	12
12	otherwise have been possible	5
13	otherwise have been possible	5
14	have been [adv] possible	7
15	have been [adv] possible	7
16	have been possible [prep]	63
17	have been possible [prep]	63
18	have been possible for	26
19	have been possible for	26
20	have been possible [verb]	24
21	have been possible [to-vb]	23
22	have been possible without	22
23	have been possible without	22
24	have been possible [conj]	15
25	have been possible [subord]	14
26	have been possible if	11
27	have been possible if	11
28	have been possible [adv]	8
29	have been possible [adv]	8
30	have been possible in	6