SN4 ""

No	Pattern	Freq
1	have not [adv] been [vb pp]	692
2	have not yet been [verb]	465
3	has not [adv] been [verb]	336
4	had not [adv] been [verb]	185
5	have not [adv] been [verb]	182
6	have not previously been [verb]	41
7	have not always been [verb]	36
8	have not even been [verb]	35
9	have not already been [verb]	32
10	have not [adv] been make	22
11	have not [adv] been made	22
12	have not [adv] been [v-ing]	18
13	have not [adv] been give	16
14	have not [adv] been given	16
15	have not [adv] been find	13
16	have not [adv] been found	13
17	have not only been [verb]	13
18	have not [adv] been establish	12
19	have not [adv] been established	12
20	have not really been [verb]	12
21	have not [adv] been identify	11
22	have not [adv] been invented	11
23	have not [adv] been identified	11
24	have not [adv] been invent	11
25	have not [adv] been published	10
26	have not [adv] been publish	10
27	have not [adv] been release	10
28	have not [adv] been accept	10
29	have not [adv] been released	10
30	have not [adv] been accepted	10