SN4 ""

No	Pattern	Freq
1	have been [v-ing] at	446
2	[vb past] been [v-ing] at	177
3	[vb base] been [v-ing] at	159
4	had been [v-ing] at	148
5	[verb] been looking at	135
6	have been [v-ing] at	90
7	[vb -s] been [v-ing] at	89
8	has been [v-ing] at	73
9	've been [v-ing] at	69
10	[verb] been working at	41
11	'd been [v-ing] at	29
12	's been [v-ing] at	16
13	[vb infin] been [v-ing] at	15
14	have been [v-ing] at	14
15	[verb] been sitting at	13
16	[verb] been staying at	13
17	[verb] been living at	13
18	[verb] been running at	11
19	[verb] been staring at	9
20	[verb] been happening at	7
21	[verb] been doing at	6
22	[verb] been standing at	6
23	[verb] been growing at	6
24	[verb] been trading at	5
25	to have been [v-ing] at	5
26	[to-vb] been [v-ing] at	5