SN4 ""

No	Pattern	Freq
1	[pron] could have [noun]	107
2	[pers pn] could have [noun]	105
3	[noun] could have [noun]	48
4	you could have [noun]	30
5	you could have [noun]	30
6	[noun sg] could have [noun]	26
7	we could have [noun]	23
8	we could have [noun]	23
9	i could have [noun]	21
10	i could have [noun]	21
11	[noun pl] could have [noun]	14
12	they could have [noun]	11
13	they could have [noun]	11
14	he could have [noun]	10
15	he could have [noun]	10
16	[adj] could have [noun]	7
17	she could have [noun]	6
18	she could have [noun]	6
19	[conj] could have [noun]	5
20	[det] could have [noun]	5
21	[noun prp] could have [noun]	5
22	could [adv] have [noun]	59
23	could [not/n't] have [noun]	37
24	could not have [noun]	37
25	could n't have [noun]	30
26	could [verb] have [noun]	24
27	could [vb infin] have [noun]	24
28	could [adv] have [noun]	22
29	could [pron] have [noun]	18
30	could [pers pn] have [noun]	18