SN4 ""

No	Pattern	Freq
1	have [been] used for [noun]	62
2	have [been] used for [adj]	61
3	have [been] used for [art]	40
4	have [been] used for [art]	40
5	have [been] used for [noun sg]	39
6	have [been] used for [det]	27
7	have [been] used for [adj]	27
8	have [been] used for the	26
9	have [been] used for the	26
10	have [been] used for [noun pl]	21
11	have [been] used for many	14
12	have [been] used for a	14
13	have [been] used for many	14
14	have [been] used for [verb]	13
15	have [been] used for [v-ing]	13
16	have [been] used for a	12
17	have [been] used for [adv]	8
18	have [been] used for [num]	7
19	have [been] used for [adv]	7
20	have [been] used for this	6
21	have [been] used for year	6
22	have [been] used for years	6
23	have [been] used for this	6
24	[noun] have [been] used for	82
25	[pron] have [been] used for	42
26	[noun sg] have [been] used for	38
27	[noun pl] have [been] used for	37
28	which have [been] used for	22
29	[Wh det] have [been] used for	22
30	which have [been] used for	22