SN4 ""

No	Pattern	Freq
1	[pron] could have come	40
2	[pers pn] could have come	36
3	[noun] could have come	34
4	[noun sg] could have come	19
5	they could have come	10
6	they could have come	10
7	[conj] could have come	8
8	he could have come	7
9	[noun pl] could have come	7
10	he could have come	7
11	we could have come	6
12	that could have come	6
13	we could have come	6
14	that could have come	6
15	[that] could have come	6
16	[adj] could have come	5
17	it could have come	5
18	it could have come	5
19	[noun prp] could have come	5
20	could [adv] have come	68
21	could [not/n't] have come	41
22	could not have come	41
23	could [adv] have come	27
24	could not have come	22
25	could n't have come	19
26	could only have come	11
27	could only have come	11
28	could [pron] have come	8
29	could [pers pn] have come	7
30	could have come [prep]	53