SN4 ""

No	Pattern	Freq
1	[noun] have become a [adj] [noun sg]	244
2	[noun sg] have become a [adj] [noun]	154
3	[noun] has become a [adj] [noun]	141
4	[noun] had become a [adj] [noun]	82
5	[noun prp] have become a [adj] [noun]	51
6	[noun pl] have become a [adj] [noun]	40
7	[noun] have become a major [noun]	26
8	[noun] have become a [adj] [noun]	23
9	[noun] have become a [adj] issue	13
10	[noun] have become a [adj] issue	13
11	[noun] have become a [adj] feature	11
12	[noun] have become a [adj] feature	11
13	[noun] have become a popular [noun]	9
14	[noun] have become a [adj] problem	8
15	[noun] have become a [adj] problem	8
16	[noun] have become a regular [noun]	8
17	[noun] have become a [adj] part	7
18	[noun] have become a political [noun]	7
19	[noun] have become a [adj] part	7
20	[noun] have become a central [noun]	7
21	[noun] have become a powerful [noun]	5
22	[noun] have become a key [noun]	5