SN4 ""

No	Pattern	Freq
1	have been [v-ing] a	781
2	had been [v-ing] a	275
3	has been [v-ing] a	200
4	have been [v-ing] a	156
5	have been [v-ing] an	134
6	've been [v-ing] a	118
7	have been having a	80
8	have been [v-ing] a	65
9	'd been [v-ing] a	46
10	have been doing a	42
11	's been [v-ing] a	42
12	have been making a	36
13	have been taking a	30
14	have been wearing a	26
15	have been using a	25
16	have been running a	25
17	have been keeping a	22
18	have been expecting a	21
19	have been getting a	20
20	have been playing a	18
21	have been fighting a	15
22	have been waiting a	15
23	have been following a	13
24	to have been [v-ing] a	12
25	have been giving a	12
26	have been conducting a	11
27	have been carrying a	11
28	have been waging a	11
29	have been planning a	10
30	have been spending a	9