SN4 ""

No	Pattern	Freq
1	[pron] [modal v] be useful	353
2	[pers pn] [modal v] be useful	298
3	[noun] [modal v] be useful	268
4	it [modal v] be useful	259
5	it [modal v] be useful	259
6	[noun sg] [modal v] be useful	166
7	[noun pl] [modal v] be useful	93
8	[adj] [modal v] be useful	55
9	[det] [modal v] be useful	50
10	[conj] [modal v] be useful	50
11	[Wh det] [modal v] be useful	47
12	which [modal v] be useful	45
13	which [modal v] be useful	45
14	[that] [modal v] be useful	33
15	that [modal v] be useful	33
16	that [modal v] be useful	33
17	this [modal v] be useful	24
18	this [modal v] be useful	24
19	they [modal v] be useful	24
20	they [modal v] be useful	22
21	[coord] [modal v] be useful	16
22	that [modal v] be useful	15
23	[verb] [modal v] be useful	15
24	that [modal v] be useful	15
25	these [modal v] be useful	10
26	these [modal v] be useful	10
27	and [modal v] be useful	9
28	and [modal v] be useful	9
29	who [modal v] be useful	7
30	approach [modal v] be useful	7