SN4 ""

No	Pattern	Freq
1	have been [v-ing] [noun pl]	200
2	has been [v-ing] [noun pl]	153
3	had been [v-ing] [noun pl]	145
4	've been [v-ing] [noun pl]	87
5	have been making [noun pl]	42
6	have been [v-ing] [noun pl]	39
7	's been [v-ing] [noun pl]	32
8	have been [v-ing] things	30
9	'd been [v-ing] [noun pl]	27
10	have been taking [noun pl]	26
11	have been having [noun pl]	26
12	have been doing [noun pl]	16
13	have been writing [noun pl]	14
14	have been using [noun pl]	14
15	have been telling [noun pl]	14
16	have been visiting [noun pl]	12
17	have been playing [noun pl]	11
18	have been collecting [noun pl]	11
19	have been [v-ing] problems	11
20	have been selling [noun pl]	10
21	have been hearing [noun pl]	9
22	have been [v-ing] ways	9
23	have been developing [noun pl]	9
24	have been watching [noun pl]	9
25	have been growing [noun pl]	9
26	have been [v-ing] letters	9
27	have been holding [noun pl]	8
28	have been running [noun pl]	8
29	have been [v-ing] lessons	7
30	have been buying [noun pl]	6