SN4 ""

No	Pattern	Freq
1	there have [been] attempts	30
2	there have [been] attempts	30
3	[ex0] have [been] attempts	30
4	[pron] have [been] attempts	30
5	have [adv] [been] attempts	5
6	have [adv] [been] attempts	5
7	have [been] [adj] attempts	36
8	have [been] [det] attempts	21
9	have [been] [adj] attempts	12
10	have [been] several attempts	7
11	have [been] many attempts	7
12	have [been] many attempts	7
13	have [been] several attempts	7
14	have [been] few attempts	5
15	have [been] few attempts	5
16	have [been] attempts [verb]	21
17	have [been] attempts [to-vb]	21
18	have [been] attempts [prep]	9
19	have [been] attempts [prep]	9