SN4 ""

No	Pattern	Freq
1	[verb] become a [noun]	775
2	have become a [noun]	774
3	[vb -s] become a [noun]	370
4	has become a [noun]	364
5	[vb past] become a [noun]	297
6	had become a [noun]	297
7	[vb base] become a [noun]	56
8	have become a [noun]	46
9	[vb infin] become a [noun]	28
10	have become a [noun]	27
11	[be] become a [noun]	20
12	be become a [noun]	20
13	[is] become a [noun]	19
14	's become a [noun]	17
15	[adv] become a [noun]	14
16	not become a [noun]	14
17	[not/n't] become a [noun]	14
18	having become a [noun]	11
19	[to-vb] become a [noun]	11
20	[v-ing] become a [noun]	11
21	to have become a [noun]	11
22	've become a [noun]	10
23	not become a [noun]	10
24	's become a [noun]	6
25	become [adv] a [noun]	25
26	become [adv] a [noun]	25
27	become [prep] a [noun]	13
28	become [prep] a [noun]	13
29	become like a [noun]	11
30	become like a [noun]	11