SN4 ""

No	Pattern	Freq
1	[verb] become a [noun]	878
2	have become a [noun]	877
3	[vb -s] become a [noun]	411
4	has become a [noun]	404
5	had become a [noun]	339
6	[vb past] become a [noun]	339
7	[vb base] become a [noun]	67
8	have become a [noun]	54
9	[vb infin] become a [noun]	32
10	have become a [noun]	31
11	[be] become a [noun]	24
12	be become a [noun]	24
13	[is] become a [noun]	22
14	[adv] become a [noun]	19
15	's become a [noun]	19
16	not become a [noun]	19
17	[not/n't] become a [noun]	19
18	not become a [noun]	15
19	[v-ing] become a [noun]	14
20	having become a [noun]	14
21	to have become a [noun]	13
22	've become a [noun]	13
23	[to-vb] become a [noun]	13
24	's become a [noun]	7
25	become [adv] a [noun]	29
26	become [adv] a [noun]	29
27	become [prep] a [noun]	15
28	become [prep] a [noun]	15
29	become like a [noun]	13
30	become like a [noun]	13