SN4 ""

No	Pattern	Freq
1	[verb] been used for	195
2	have been used for	195
3	[vb -s] been used for	69
4	has been used for	62
5	[vb base] been used for	54
6	have been used for	53
7	[adv] been used for	49
8	had been used for	36
9	[vb past] been used for	36
10	[adv] been used for	32
11	[vb infin] been used for	23
12	have been used for	23
13	[not/n't] been used for	17
14	not been used for	17
15	not been used for	12
16	to have been used for	10
17	[to-vb] been used for	10
18	's been used for	7
19	never been used for	5
20	n't been used for	5
21	only been used for	5
22	never been used for	5
23	only been used for	5
24	been [adv] used for	12
25	been [adv] used for	12
26	been widely used for	7
27	been widely used for	7
28	been used [adv] for	16
29	been used [adv] for	16
30	been used [to-vb] for	5