SN4 ""

No	Pattern	Freq
1	[conj] [pron] could have been [det]	13
2	[coord] [pron] could have been [det]	8
3	but [pron] could have been [det]	6
4	but [pron] could have been [det]	6
5	[pron] could [adv] have been [det]	19
6	[pron] could [not/n't] have been [det]	16
7	[pron] could not have been [det]	16
8	[pron] could n't have been [det]	10
9	[pron] could not have been [det]	6
10	[pron] could have been [prep] [det]	8
11	[pron] could have been [prep] [det]	8
12	[pron] could have been [adv] [det]	6
13	[pron] could have been [adv] [det]	6
14	[pron] could have been [det] [noun]	23
15	[pron] could have been [det] [noun sg]	21
16	[pron] could have been [det] [adj]	10
17	[pron] could have been [det] of	5
18	[pron] could have been [det] one	5
19	[pron] could have been [det] of	5
20	[pron] could have been [det] [prep]	5
21	[pron] could have been [det] [num]	5
22	[pron] could have been [det] [prep]	5
23	[pron] could have been [det] [adj]	5
24	[pron] could have been [det] one	5