SN4 ""

No	Pattern	Freq
1	[pron] is [adv] [verb] that [det]	166
2	[pers pn] is [adv] [verb] that [det]	159
3	it is [adv] [verb] that [det]	158
4	it is [adv] [verb] that [det]	158
5	[adj] is [adv] [verb] that [det]	41
6	[det] is [adv] [verb] that [det]	41
7	this is [adv] [verb] that [det]	34
8	this is [adv] [verb] that [det]	34
9	[noun] is [adv] [verb] that [det]	10
10	that is [adv] [verb] that [det]	7
11	that is [adv] [verb] that [det]	7
12	[noun sg] is [adv] [verb] that [det]	6
13	is [adv] [adv] [verb] that [det]	24
14	is [adv] [adv] [verb] that [det]	15
15	is [not/n't] [adv] [verb] that [det]	9
16	is not [adv] [verb] that [det]	9
17	is not [adv] [verb] that [det]	9
18	is [adj] [adv] [verb] that [det]	8
19	is [adj] [adv] [verb] that [det]	8
20	is now [adv] [verb] that [det]	7
21	is now [adv] [verb] that [det]	7
22	is [adv] [adj] [verb] that [det]	77
23	is [adv] [adj] [verb] that [det]	73
24	is [adv] [adv] [verb] that [det]	24
25	is [adv] [adv] [verb] that [det]	23
26	is [adv] true [verb] that [det]	12
27	is [adv] true [verb] that [det]	12
28	is [adv] important [verb] that [det]	10
29	is [adv] important [verb] that [det]	10
30	is [adv] possible [verb] that [det]	6