SN4 ""

No	Pattern	Freq
1	[conj] it become impossible	7
2	it [adv] become impossible	7
3	it [modal v] become impossible	7
4	it [vb mod] become impossible	7
5	it [adv] become impossible	7
6	it [verb] become impossible	6
7	it have become impossible	6
8	it become [adv] impossible	11
9	it become [adv] impossible	11
10	it become almost impossible	5
11	it become almost impossible	5
12	it become virtually impossible	5
13	it become virtually impossible	5
14	it become impossible [to-vb]	15
15	it become impossible [verb]	15
16	it become impossible [prep]	7
17	it become impossible [prep]	7