SN4 ""

No	Pattern	Freq
1	[be] not so simple	36
2	be not so simple	36
3	[is] not so simple	19
4	is not so simple	15
5	[am/are] not so simple	10
6	are not so simple	10
7	[was/were] not so simple	7
8	was not so simple	6
9	not [adv] so simple	14
10	not [adv] so simple	14
11	not quite so simple	12
12	not quite so simple	12
13	not [be] so simple	7
14	not be so simple	7
15	not [be] so simple	7
16	not be so simple	7
17	not so simple [conj]	7
18	not so simple [subord]	6
19	not so simple as	5
20	not so simple as	5