SN4 ""

No	Pattern	Freq
1	have [be] seen	54
2	have be seen	54
3	have [been] seen	53
4	have been seen	53
5	have [adv] seen	8
6	have [adv] seen	8
7	[modal v] have seen	702
8	[vb mod] have seen	702
9	would have seen	145
10	must have seen	139
11	must have seen	139
12	[adv] have seen	124
13	would have seen	121
14	may have seen	114
15	may have seen	114
16	should have seen	112
17	should have seen	112
18	will have seen	85
19	[adv] have seen	74
20	will have seen	69
21	might have seen	55
22	might have seen	55
23	could have seen	51
24	could have seen	51
25	not have seen	50
26	[not/n't] have seen	50
27	n't have seen	26
28	'd have seen	24
29	not have seen	24
30	never have seen	17