SN4 ""

No	Pattern	Freq
1	not have been [vb pp] [prep]	289
2	not have been [verb] [prep]	276
3	not have been [verb] [prep]	266
4	not have been [verb] by	79
5	not have been [verb] in	45
6	n't have been [verb] [prep]	33
7	not have been [verb] to	31
8	not to have been [verb] [prep]	25
9	not have been [v-ing] [prep]	20
10	not have been [verb] for	19
11	not have been [verb] with	19
12	not have been [verb] without	17
13	not have been [verb] on	16
14	not having been [verb] [prep]	16
15	not have been [verb] at	13
16	not have been [verb] from	13
17	not have been achieve [prep]	10
18	not have been achieved [prep]	10
19	not have been [verb] of	8
20	not have been [verb] as	8
21	not have been make [prep]	8
22	not have been made [prep]	7
23	not have been [verb] before	7
24	not have been [verb] into	7
25	not have been done [prep]	6
26	not have been taken [prep]	6
27	not have been do [prep]	6
28	not have been obtain [prep]	6
29	not have been [verb] upon	6
30	not have been obtained [prep]	6