SN4 ""

No	Pattern	Freq
1	[noun] which could have	131
2	[noun sg] which could have	80
3	[noun pl] which could have	49
4	[verb] which could have	8
5	[prep] which could have	5
6	[prep] which could have	5
7	which [pron] could have	54
8	which [pers pn] could have	51
9	which he could have	17
10	which he could have	17
11	which they could have	13
12	which they could have	13
13	which [noun] could have	13
14	which it could have	8
15	which it could have	8
16	which [noun prp] could have	7
17	which [noun sg] could have	6
18	which could [adv] have	60
19	which could [adv] have	38
20	which could not have	22
21	which could [not/n't] have	22
22	which could not have	22
23	which could well have	6
24	which could well have	6
25	which could easily have	5
26	which could easily have	5
27	which could have [verb]	96
28	which could have [vb pp]	96
29	which could have [been]	88
30	which could have been	88