SN4 ""

No	Pattern	Freq
1	have been [v-ing] for [noun]	270
2	have [been] [v-ing] for [noun pl]	170
3	had [been] [v-ing] for [noun]	81
4	have [been] [v-ing] for years	79
5	have [been] [v-ing] for year	79
6	have [been] [v-ing] for [noun]	73
7	have [been] [v-ing] for [noun sg]	54
8	have [been] [v-ing] for [noun prp]	39
9	've [been] [v-ing] for [noun]	37
10	has [been] [v-ing] for [noun]	32
11	have [been] waiting for [noun]	23
12	have [been] looking for [noun]	20
13	's [been] [v-ing] for [noun]	16
14	have [been] trying for [noun]	15
15	have [been] [v-ing] for [noun]	15
16	have [been] doing for [noun]	12
17	have [been] [v-ing] for ages	12
18	have [been] [v-ing] for age	12
19	'd [been] [v-ing] for [noun]	12
20	have [been] [v-ing] for month	12
21	have [been] [v-ing] for months	12
22	have [been] [v-ing] for days	10
23	have [been] [v-ing] for day	10
24	have [been] [v-ing] for week	9
25	have [been] campaigning for [noun]	9
26	have [been] working for [noun]	8
27	have [been] fighting for [noun]	8
28	have [been] [v-ing] for weeks	8
29	have [been] [v-ing] for decades	7
30	have [been] pressing for [noun]	7