SN4 ""

No	Pattern	Freq
1	[conj] [pron] is not [to-vb]	26
2	[subord] [pron] is not [to-vb]	19
3	if [pron] is not [to-vb]	15
4	if [pron] is not [to-vb]	15
5	[adj] [pron] is not [to-vb]	7
6	[adj] [pron] is not [to-vb]	7
7	[prep] [pron] is not [to-vb]	6
8	[prep] [pron] is not [to-vb]	6
9	[pron] [noun] is not [to-vb]	43
10	[pron] [noun sg] is not [to-vb]	42
11	[pron] purpose is not [to-vb]	7
12	[pron] purpose is not [to-vb]	7
13	[pron] [verb] is not [to-vb]	5
14	[pron] is [adj] not [to-vb]	215
15	[pron] is [adj] not [to-vb]	173
16	[pron] is important not [to-vb]	82
17	[pron] is important not [to-vb]	82
18	[pron] is good not [to-vb]	39
19	[pron] is difficult not [to-vb]	28
20	[pron] is difficult not [to-vb]	28
21	[pron] is [adj -er] not [to-vb]	22
22	[pron] is [adj -est] not [to-vb]	20
23	[pron] is best not [to-vb]	20
24	[pron] is better not [to-vb]	19
25	[pron] is [verb] not [to-vb]	17
26	[pron] is [vb pp] not [to-vb]	16
27	[pron] is hard not [to-vb]	16
28	[pron] is hard not [to-vb]	16
29	[pron] is impossible not [to-vb]	8
30	[pron] is impossible not [to-vb]	8