SN4 ""

No	Pattern	Freq
1	what used to be	139
2	what used to [be]	139
3	what used to be	139
4	what used to [be]	139
5	[prep] what used to	86
6	[prep] what used to	86
7	of what used to	28
8	of what used to	28
9	in what used to	26
10	in what used to	26
11	[verb] what used to	15
12	[conj] what used to	9
13	to what used to	7
14	[coord] what used to	7
15	to what used to	7
16	on what used to	6
17	on what used to	6
18	[be] what used to	6
19	be what used to	6
20	[v-ing] what used to	5
21	and what used to	5
22	[is] what used to	5
23	and what used to	5
24	what [pron] used to	68
25	what [pers pn] used to	67
26	what it used to	31
27	what it used to	31
28	what they used to	22
29	what they used to	22
30	what [noun] used to	7