SN4 ""

No	Pattern	Freq
1	have been [v-ing] for [num] [noun]	159
2	have be [v-ing] for [num] [noun pl]	156
3	have be [v-ing] for [num] year	104
4	have be [v-ing] for [num] years	103
5	has be [v-ing] for [num] [noun]	56
6	had be [v-ing] for [num] [noun]	47
7	have be [v-ing] for three [noun]	21
8	have be [v-ing] for [num] [noun]	19
9	have be [v-ing] for two [noun]	19
10	have be running for [num] [noun]	19
11	have be [v-ing] for [num] hour	18
12	have be [v-ing] for [num] hours	17
13	have be going for [num] [noun]	14
14	's be [v-ing] for [num] [noun]	14
15	have be missing for [num] [noun]	13
16	've be [v-ing] for [num] [noun]	13
17	have be [v-ing] for [num] months	12
18	have be [v-ing] for [num] day	12
19	have be [v-ing] for [num] month	12
20	have be [v-ing] for [num] days	12
21	have be [v-ing] for five [noun]	11
22	have be [v-ing] for twenty [noun]	9
23	have be working for [num] [noun]	9
24	have be [v-ing] for ten [noun]	8
25	have be [v-ing] for six [noun]	8
26	'd be [v-ing] for [num] [noun]	7
27	have be travelling for [num] [noun]	7
28	have be flying for [num] [noun]	7
29	have be [v-ing] for four [noun]	6
30	have be [v-ing] for [num] weeks	6