SN4 ""

No	Pattern	Freq
1	[verb] [that] it be impossible [to-vb]	55
2	[noun] [that] it be impossible [to-vb]	32
3	[noun sg] [that] it be impossible [to-vb]	26
4	[vb past] [that] it be impossible [to-vb]	17
5	[adv] [that] it be impossible [to-vb]	15
6	[adv] [that] it be impossible [to-vb]	12
7	[adj] [that] it be impossible [to-vb]	12
8	[adj] [that] it be impossible [to-vb]	11
9	[is] [that] it be impossible [to-vb]	10
10	[vb base] [that] it be impossible [to-vb]	10
11	is [that] it be impossible [to-vb]	10
12	[vb pp] [that] it be impossible [to-vb]	10
13	say [that] it be impossible [to-vb]	10
14	be [that] it be impossible [to-vb]	10
15	[be] [that] it be impossible [to-vb]	10
16	believe [that] it be impossible [to-vb]	6
17	so [that] it be impossible [to-vb]	6
18	show [that] it be impossible [to-vb]	6
19	[to-vb] [that] it be impossible [to-vb]	6
20	so [that] it be impossible [to-vb]	6
21	[vb -s] [that] it be impossible [to-vb]	6
22	mean [that] it be impossible [to-vb]	5
23	believe [that] it be impossible [to-vb]	5
24	[that] it [vb mod] be impossible [to-vb]	29
25	[that] it [modal v] be impossible [to-vb]	29
26	[that] it would be impossible [to-vb]	23
27	[that] it would be impossible [to-vb]	23
28	[that] it be [adv] impossible [to-vb]	31
29	[that] it be [adv] impossible [to-vb]	30
30	[that] it be almost impossible [to-vb]	14