SN4 ""

No	Pattern	Freq
1	it have been [vb pp] that [adj]	115
2	it have been [verb] that [adj]	115
3	it has been [verb] that [adj]	105
4	it have been suggest that [adj]	22
5	it have been suggested that [adj]	22
6	it have been show that [adj]	13
7	it have been argued that [adj]	13
8	it have been shown that [adj]	13
9	it have been argue that [adj]	13
10	it have been claim that [adj]	8
11	it have been claimed that [adj]	8
12	it have been estimate that [adj]	8
13	it had been [verb] that [adj]	8
14	it have been estimated that [adj]	8
15	it have been find that [adj]	6
16	it have been report that [adj]	6
17	it have been found that [adj]	6
18	it have been reported that [adj]	6
19	it have been established that [adj]	5
20	it have been assume that [adj]	5
21	it have been establish that [adj]	5
22	it have been assumed that [adj]	5