SN4 ""

No	Pattern	Freq
1	[modal v] account for	323
2	[vb mod] account for	323
3	[adv] account for	192
4	[not/n't] account for	102
5	not account for	102
6	[adv] account for	90
7	not account for	87
8	may account for	82
9	may account for	82
10	could account for	55
11	could account for	55
12	can account for	51
13	can account for	51
14	would account for	41
15	would account for	41
16	will account for	40
17	will account for	40
18	might account for	31
19	might account for	31
20	[pron] account for	28
21	[pers pn] account for	27
22	must account for	15
23	n't account for	15
24	also account for	15
25	also account for	15
26	must account for	15
27	we account for	12
28	we account for	12
29	well account for	11
30	well account for	11