SN4 ""

No	Pattern	Freq
1	had been [vb pp] since	121
2	have been [vb pp] since	109
3	has been [vb pp] since	95
4	have been killed since	19
5	have been made since	16
6	have been closed since	14
7	have been held since	14
8	have been known since	10
9	have been suspended since	10
10	having been [vb pp] since	9
11	have been used since	9
12	have been lost since	8
13	have been published since	7
14	have been built since	6
15	have been paid since	6
16	to have been [vb pp] since	6
17	have been seen since	5
18	have been delayed since	5
19	have been practised since	5
20	have been [vb pp] since	5
21	have been introduced since	5