SN4 ""

No	Pattern	Freq
1	[verb] [that] it be impossible	76
2	[noun] [that] it be impossible	41
3	[noun sg] [that] it be impossible	34
4	[vb past] [that] it be impossible	23
5	[adj] [that] it be impossible	22
6	[adv] [that] it be impossible	20
7	[adj] [that] it be impossible	18
8	[adv] [that] it be impossible	15
9	[vb base] [that] it be impossible	14
10	[vb pp] [that] it be impossible	12
11	say [that] it be impossible	12
12	[is] [that] it be impossible	11
13	is [that] it be impossible	11
14	be [that] it be impossible	11
15	[be] [that] it be impossible	11
16	[conj] [that] it be impossible	10
17	[coord] [that] it be impossible	10
18	[vb -s] [that] it be impossible	9
19	so [that] it be impossible	9
20	[to-vb] [that] it be impossible	9
21	so [that] it be impossible	9
22	show [that] it be impossible	8
23	mean [that] it be impossible	7
24	and [that] it be impossible	7
25	and [that] it be impossible	7
26	[vb infin] [that] it be impossible	6
27	believe [that] it be impossible	6
28	believe [that] it be impossible	5
29	[that] it [modal v] be impossible	43
30	[that] it [vb mod] be impossible	43