SN4 ""

No	Pattern	Freq
1	[conj] there must have been [adj]	20
2	[coord] there must have been [adj]	11
3	that there must have been [adj]	8
4	that there must have been [adj]	8
5	[that] there must have been [adj]	8
6	[noun] there must have been [adj]	8
7	but there must have been [adj]	6
8	but there must have been [adj]	6
9	[adv] there must have been [adj]	5
10	and there must have been [adj]	5
11	[noun sg] there must have been [adj]	5
12	[adv] there must have been [adj]	5
13	and there must have been [adj]	5
14	there must have been [art] [adj]	28
15	there must have been [art] [adj]	28
16	there must have been a [adj]	27
17	there must have been a [adj]	24
18	there must have been [adj] [adj]	17
19	there must have been [det] [adj]	12
20	there must have been [adv] [adj]	10
21	there must have been [adv] [adj]	10
22	there must have been many [adj]	9
23	there must have been many [adj]	9
24	there must have been something [adj]	6
25	there must have been [indef pn] [adj]	6
26	there must have been something [adj]	6
27	there must have been about [adj]	6
28	there must have been [pron] [adj]	6
29	there must have been about [adj]	6
30	there must have been [adj] [noun]	47