SN4 ""

No	Pattern	Freq
1	have been [adj] [noun pl]	393
2	have been [adj] [noun sg]	76
3	have been [adj] change	34
4	have been [adj] changes	34
5	have been other [noun]	26
6	have been numerous [noun]	25
7	have been major [noun]	18
8	have been significant [noun]	17
9	have been [adj] development	15
10	have been [adj] developments	15
11	have been various [noun]	14
12	have been [adj] attempt	12
13	have been [adj] attempts	12
14	have been great [noun]	11
15	have been busy [noun]	11
16	have been important [noun]	10
17	have been frequent [noun]	10
18	have been regular [noun]	9
19	have been [adj] reports	9
20	have been [adj] report	9
21	have been good [noun]	9
22	have been considerable [noun]	7
23	have been [adj] [noun prp]	6
24	have been recent [noun]	6
25	have been [adj] improvement	6
26	have been [adj] improvements	6
27	have been [adj] studies	6
28	have been [adj] ones	6
29	have been [adj] advances	6
30	have been dramatic [noun]	6