SN4 ""

No	Pattern	Freq
1	[pron] must have been in	51
2	[pers pn] must have been in	49
3	[noun] must have been in	24
4	it must have been in	16
5	it must have been in	16
6	[noun sg] must have been in	15
7	he must have been in	10
8	he must have been in	10
9	she must have been in	10
10	she must have been in	10
11	they must have been in	6
12	[noun pl] must have been in	6
13	they must have been in	5
14	must have been [verb] in	54
15	must have been [vb pp] in	40
16	must have been [adj] in	26
17	must have been [adj] in	25
18	must have been [v-ing] in	14
19	must have been in [art]	34
20	must have been in [art]	34
21	must have been in the	24
22	must have been in the	24
23	must have been in [noun]	20
24	must have been in [noun sg]	17
25	must have been in [adj]	16
26	must have been in [pron]	11
27	must have been in a	10
28	must have been in a	10
29	must have been in [pos pn]	10
30	must have been in [adv]	7