SN4 ""

No	Pattern	Freq
1	had [vb pp] before	209
2	have gone before	121
3	have [vb pp] before	119
4	has [vb pp] before	112
5	've [vb pp] before	95
6	have said before	66
7	have happened before	54
8	have done before	49
9	have seen before	43
10	have met before	32
11	have [vb pp] before	32
12	's [vb pp] before	25
13	'd [vb pp] before	23
14	have had before	22
15	have heard before	18
16	have known before	10
17	have mentioned before	8
18	have experienced before	8
19	have played before	7
20	have used before	7
21	have existed before	7
22	have lived before	7
23	have come before	6
24	having [vb pp] before	6
25	have noticed before	6
26	have looked before	6
27	have encountered before	5
28	have won before	5
29	have worked before	5
30	have occurred before	5