SN4 ""

No	Pattern	Freq
1	[verb] that [pron] could [adv] have	50
2	[noun] that [pron] could [adv] have	36
3	[noun sg] that [pron] could [adv] have	31
4	[adj] that [pron] could [adv] have	22
5	[adj] that [pron] could [adv] have	17
6	[vb past] that [pron] could [adv] have	14
7	[adv] that [pron] could [adv] have	14
8	know that [pron] could [adv] have	12
9	[adv] that [pron] could [adv] have	9
10	say that [pron] could [adv] have	9
11	[vb pp] that [pron] could [adv] have	9
12	[v-ing] that [pron] could [adv] have	9
13	[vb base] that [pron] could [adv] have	8
14	[be] that [pron] could [adv] have	6
15	be that [pron] could [adv] have	6
16	[vb infin] that [pron] could [adv] have	6
17	[noun pl] that [pron] could [adv] have	5
18	[pron] that [pron] could [adv] have	5
19	[det] that [pron] could [adv] have	5
20	that [pron] could [adv] [adv] have	16
21	that [pron] could not [adv] have	12
22	that [pron] could [not/n't] [adv] have	12
23	that [pron] could not [adv] have	8
24	that [pron] could [adv] [adv] have	16
25	that [pron] could [adv] [adv] have	16
26	that [pron] could [adv] possibly have	6
27	that [pron] could [adv] possibly have	6
28	that [pron] could [adv] have [vb pp]	78
29	that [pron] could [adv] have [verb]	78
30	that [pron] could [adv] have been	27