SN4 ""

No	Pattern	Freq
1	[vb mod] have become	276
2	[modal v] have become	276
3	[adv] have become	84
4	may have become	66
5	[adv] have become	66
6	may have become	66
7	would have become	58
8	would have become	58
9	might have become	39
10	might have become	39
11	will have become	36
12	will have become	35
13	should have become	31
14	should have become	31
15	must have become	24
16	must have become	24
17	could have become	21
18	could have become	21
19	not have become	18
20	[not/n't] have become	18
21	well have become	15
22	well have become	15
23	not have become	15
24	never have become	13
25	never have become	13
26	easily have become	8
27	easily have become	8
28	[pron] have become	5
29	[noun] have become	5
30	have become [adj]	129