SN4 ""

No	Pattern	Freq
1	[noun] and when it	70
2	[subord] and when it	55
3	[conj] and when it	55
4	[noun sg] and when it	47
5	as and when it	28
6	as and when it	28
7	[verb] and when it	28
8	if and when it	27
9	if and when it	27
10	[adv] and when it	25
11	[adj] and when it	23
12	[noun pl] and when it	19
13	[adj] and when it	16
14	[adv] and when it	11
15	[vb pp] and when it	9
16	[Wh adv] and when it	8
17	how and when it	6
18	[adv prt] and when it	6
19	how and when it	6
20	[pers pn] and when it	5
21	[pron] and when it	5
22	and [adv] when it	63
23	and [adv] when it	61
24	and [noun] when it	45
25	and then when it	28
26	and then when it	28
27	and [adj] when it	25
28	and [verb] when it	24
29	and [adj] when it	23
30	and [noun sg] when it	23