SN4 ""

No	Pattern	Freq
1	[noun] is that [noun]	815
2	[noun sg] is that [noun]	704
3	[pron] is that [noun]	223
4	[adj] is that [noun]	170
5	[verb] is that [noun]	136
6	[pers pn] is that [noun]	116
7	[adv] is that [noun]	114
8	it is that [noun]	103
9	it is that [noun]	103
10	[noun pl] is that [noun]	83
11	[adv] is that [noun]	76
12	[det] is that [noun]	75
13	[adj] is that [noun]	57
14	[Wh det] is that [noun]	54
15	this is that [noun]	45
16	this is that [noun]	45
17	what is that [noun]	43
18	what is that [noun]	43
19	point is that [noun]	34
20	point is that [noun]	34
21	there is that [noun]	33
22	[to-vb] is that [noun]	33
23	there is that [noun]	33
24	[ex0] is that [noun]	33
25	problem is that [noun]	32
26	[Wh adv] is that [noun]	32
27	problem is that [noun]	32
28	[vb pp] is that [noun]	31
29	[conj] is that [noun]	26
30	[coord] is that [noun]	25