SN4 ""

No	Pattern	Freq
1	[noun] have been operating [prep]	21
2	[pron] have been operating [prep]	13
3	[noun sg] have been operating [prep]	13
4	which have been operating [prep]	9
5	[Wh det] have been operating [prep]	9
6	which have been operating [prep]	9
7	[noun pl] have been operating [prep]	6
8	have [adv] been operating [prep]	7
9	have [adv] been operating [prep]	7
10	have been operating [adv] [prep]	9
11	have been operating [adv] [prep]	7
12	have been operating [prep] [art]	16
13	have been operating [prep] [art]	16
14	have been operating [prep] [adj]	14
15	have been operating [prep] [noun]	13
16	have been operating [prep] [noun prp]	10
17	have been operating [prep] the	8
18	have been operating [prep] the	8
19	have been operating [prep] a	8
20	have been operating [prep] [adv]	7
21	have been operating [prep] [adv]	7
22	have been operating [prep] [num]	7
23	have been operating [prep] a	6