SN4 ""

No	Pattern	Freq
1	[verb] not understand	528
2	do not understand	479
3	[modal v] not understand	414
4	[vb mod] not understand	414
5	[vb base] not understand	233
6	do not understand	222
7	[vb past] not understand	208
8	did not understand	188
9	could not understand	186
10	could not understand	186
11	can not understand	158
12	can not understand	158
13	[vb -s] not understand	78
14	does not understand	69
15	[be] not understand	62
16	be not understand	62
17	may not understand	35
18	may not understand	35
19	have not understand	26
20	is not understand	26
21	[is] not understand	26
22	[adv] not understand	23
23	[adv] not understand	23
24	[conj] not understand	20
25	[prep] not understand	20
26	[prep] not understand	20
27	[was/were] not understand	19
28	[am/are] not understand	17
29	[coord] not understand	15
30	[pron] not understand	15