SN4 ""

No	Pattern	Freq
1	[noun] have become a [adj] [noun sg]	340
2	[noun] have become a [adj] [noun]	247
3	[noun sg] have become a [adj] [noun]	208
4	[noun] has become a [adj] [noun]	194
5	[noun] had become a [adj] [noun]	113
6	[noun] have become an [adj] [noun]	97
7	[noun prp] have become a [adj] [noun]	73
8	[noun pl] have become a [adj] [noun]	60
9	[noun] have become a [adj] [noun]	35
10	[noun] have become a [adj] part	30
11	[noun] have become a [adj] part	30
12	[noun] have become a major [noun]	26
13	[noun] have become a important [noun]	15
14	[noun] have become a [adj] issue	15
15	[noun] have become a [adj] issue	15
16	[noun] have become a [adj] feature	12
17	[noun] have become a [adj] feature	12
18	[noun] have become a popular [noun]	9
19	[noun] have become a [adj] problem	9
20	[noun] have become a [adj] problem	9
21	[noun] have become a regular [noun]	8
22	[noun] have become a political [noun]	7
23	[noun] have become a integral [noun]	7
24	[noun] have become a central [noun]	7
25	[noun] have become a [adj] factor	6
26	[noun] have become a accepted [noun]	6
27	[noun] have become a [adj] factor	6
28	[noun] have become a essential [noun]	5
29	[noun] have become a [adj] force	5
30	[noun] have become a powerful [noun]	5