SN4 ""

No	Pattern	Freq
1	could not [vb infin] [conj]	914
2	could n't [verb] [conj]	461
3	could not [verb] [conj]	454
4	could not [verb] [coord]	346
5	could not [verb] [subord]	297
6	could not [verb] that	272
7	could not [verb] [that]	272
8	could not [verb] that	272
9	could not [verb] but	141
10	could not [verb] but	141
11	could not [verb] and	136
12	could not [verb] and	136
13	could not help [conj]	122
14	could not help [conj]	122
15	could not [verb] whether	93
16	could not [verb] whether	93
17	could not believe [conj]	92
18	could not believe [conj]	92
19	could not [verb] or	66
20	could not [verb] or	66
21	could not [verb] if	61
22	could not tell [conj]	61
23	could not tell [conj]	61
24	could not [verb] if	61
25	could not [verb] because	59
26	could not [verb] because	59
27	could not see [conj]	45
28	could not see [conj]	45
29	could not say [conj]	34
30	could not say [conj]	34