SN4 ""

No	Pattern	Freq
1	[noun] has become an	101
2	[noun sg] has become an	73
3	[pron] has become an	38
4	[pers pn] has become an	22
5	it has become an	17
6	it has become an	17
7	[noun prp] has become an	15
8	[Wh det] has become an	14
9	[noun pl] has become an	13
10	which has become an	7
11	what has become an	7
12	what has become an	7
13	which has become an	7
14	[conj] has become an	6
15	[coord] has become an	5
16	he has become an	5
17	he has become an	5
18	has become an [adj]	106
19	has become an [adj]	106
20	has become an [noun]	40
21	has become an [noun sg]	40
22	has become an important	24
23	has become an important	24
24	has become an [adv]	21
25	has become an [adv]	21
26	has become an increasingly	13
27	has become an increasingly	13
28	has become an established	6
29	has become an issue	6
30	has become an issue	6