SN4 ""

No	Pattern	Freq
1	[prep] the time when	498
2	[prep] the time when	498
3	at the time when	254
4	to the time when	59
5	from the time when	35
6	of the time when	25
7	about the time when	19
8	for the time when	19
9	during the time when	9
10	as the time when	8
11	in the time when	7
12	like the time when	7
13	since the time when	7
14	around the time when	6
15	between the time when	6
16	until the time when	5