SN4 ""

No	Pattern	Freq
1	[verb] [adv] have to be	764
2	do [adv] have to be	701
3	[vb base] [adv] have to be	323
4	[vb -s] [adv] have to be	320
5	do [adv] have to be	308
6	does [adv] have to be	304
7	[vb mod] [adv] have to be	291
8	[modal v] [adv] have to be	291
9	[noun] [adv] have to be	290
10	[pron] [adv] have to be	250
11	[pers pn] [adv] have to be	182
12	[noun sg] [adv] have to be	152
13	will [adv] have to be	126
14	[noun pl] [adv] have to be	122
15	would [adv] have to be	117
16	would [adv] have to be	113
17	will [adv] have to be	105
18	[adv] [adv] have to be	103
19	[vb past] [adv] have to be	97
20	did [adv] have to be	87
21	it [adv] have to be	77
22	it [adv] have to be	77
23	[conj] [adv] have to be	62
24	[adv] [adv] have to be	59
25	[Wh det] [adv] have to be	47
26	[coord] [adv] have to be	45
27	which [adv] have to be	45
28	which [adv] have to be	45
29	not [adv] have to be	43
30	[not/n't] [adv] have to be	43