SN4 ""

No	Pattern	Freq
1	have been [verb] to be	621
2	have been [vb pp] to be	612
3	have been shown to be	176
4	have been show to be	176
5	have been find to be	143
6	have been found to be	143
7	have been [adj] to be	46
8	have been [adj] to be	46
9	have been held to be	28
10	have been hold to be	28
11	have been report to be	23
12	have been reported to be	23
13	have been prove to be	19
14	have been design to be	16
15	have been designed to be	16
16	have been proved to be	14
17	have been say to be	12
18	have been said to be	12
19	have been consider to be	12
20	have been expect to be	12
21	have been considered to be	12
22	have been expected to be	11
23	have been assume to be	11
24	have been assumed to be	11
25	have been thought to be	10
26	have been think to be	10
27	have been known to be	9
28	have been know to be	9
29	have been [v-ing] to be	8
30	have been seen to be	7