SN4 ""

No	Pattern	Freq
1	[conj] it is [verb] and	83
2	[subord] it is [verb] and	63
3	[pron] it is [verb] and	42
4	[Wh det] it is [verb] and	37
5	[adv] it is [verb] and	31
6	[noun] it is [verb] and	29
7	which it is [verb] and	26
8	which it is [verb] and	26
9	[noun sg] it is [verb] and	22
10	[Wh adv] it is [verb] and	19
11	if it is [verb] and	18
12	if it is [verb] and	18
13	how it is [verb] and	14
14	how it is [verb] and	14
15	that it is [verb] and	12
16	that it is [verb] and	12
17	[that] it is [verb] and	12
18	[adv] it is [verb] and	11
19	what it is [verb] and	10
20	what it is [verb] and	10
21	way it is [verb] and	8
22	[coord] it is [verb] and	8
23	way it is [verb] and	8
24	when it is [verb] and	7
25	when it is [verb] and	7
26	whom it is [verb] and	5
27	until it is [verb] and	5
28	as it is [verb] and	5
29	but it is [verb] and	5
30	whom it is [verb] and	5