SN4 ""

No	Pattern	Freq
1	have been impossible	120
2	[verb] been impossible	120
3	have been impossible	87
4	[vb infin] been impossible	87
5	has been impossible	18
6	[vb -s] been impossible	18
7	[vb past] been impossible	13
8	had been impossible	13
9	been [adv] impossible	30
10	been [adv] impossible	30
11	been almost impossible	15
12	been almost impossible	15
13	been virtually impossible	5
14	been quite impossible	5
15	been quite impossible	5
16	been virtually impossible	5
17	been impossible [to-vb]	48
18	been impossible [verb]	48
19	been impossible [prep]	45
20	been impossible [prep]	45
21	been impossible for	17
22	been impossible for	17
23	been impossible without	13
24	been impossible without	13
25	been impossible [conj]	7
26	been impossible in	6
27	been impossible in	6
28	been impossible [subord]	5