SN4 ""

No	Pattern	Freq
1	have been [v-ing] for a	215
2	[verb] been [v-ing] for a	215
3	[verb] been [v-ing] for a	184
4	[vb past] been [v-ing] for a	90
5	had been [v-ing] for a	72
6	[vb base] been [v-ing] for a	62
7	[vb -s] been [v-ing] for a	55
8	have been [v-ing] for a	43
9	has been [v-ing] for a	37
10	[verb] been [v-ing] for an	31
11	[verb] been looking for a	27
12	've been [v-ing] for a	19
13	's been [v-ing] for a	18
14	'd been [v-ing] for a	18
15	[verb] been waiting for a	17
16	[verb] been trying for a	12
17	[verb] been hoping for a	9
18	[verb] been working for a	9
19	[verb] been searching for a	8
20	[verb] been pressing for a	8
21	[verb] been running for a	7
22	[verb] been campaigning for a	7
23	have been [v-ing] for a	6
24	[vb infin] been [v-ing] for a	6
25	[verb] been going for a	6