SN4 ""

No	Pattern	Freq
1	[det] [noun] could not be	97
2	[det] [noun sg] could not be	64
3	[det] [noun pl] could not be	33
4	[det] [pron] could not be	12
5	[det] who could not be	6
6	[det] who could not be	6
7	[det] [Wh pn] could not be	6
8	[conj] [det] could not be	35
9	[that] [det] could not be	16
10	that [det] could not be	16
11	that [det] could not be	16
12	[coord] [det] could not be	15
13	the [det] could not be	14
14	the [det] could not be	14
15	[art] [det] could not be	14
16	[art] [det] could not be	14
17	but [det] could not be	10
18	but [det] could not be	10
19	[adv] [det] could not be	8
20	[adv] [det] could not be	7
21	and [det] could not be	5
22	surely [det] could not be	5
23	surely [det] could not be	5
24	and [det] could not be	5
25	[verb] [det] could not be	5
26	[det] could not [adv] be	11
27	[det] could not [adv] be	11
28	[det] could not have be	8
29	[det] could not [vb infin] be	8
30	[det] could not [verb] be	8