SN4 ""

No	Pattern	Freq
1	have become a [noun sg]	759
2	has become a [noun]	364
3	had become a [noun]	297
4	have become a [noun]	46
5	have become a [noun]	27
6	have become a matter	19
7	have become a matter	19
8	have become a way	16
9	have become a way	16
10	have become a part	12
11	have become a sort	12
12	have become a bit	12
13	have become a sort	12
14	have become a bit	12
15	have become a part	12
16	have become a member	11
17	having become a [noun]	11
18	have become a member	11
19	to have become a [noun]	11
20	have become a symbol	11
21	have become a symbol	11
22	've become a [noun]	10
23	have become a kind	10
24	have become a victim	10
25	have become a kind	10
26	have become a victim	10
27	have become a habit	10
28	have become a habit	10
29	have become a problem	9
30	have become a problem	9