SN4 ""

No	Pattern	Freq
1	[prep] the problem to [be]	10
2	[prep] the problem to [be]	10
3	of the problem to [be]	7
4	of the problem to [be]	7
5	[verb] the problem to [be]	6
6	the problem [verb] to [be]	38
7	the problem [vb -s] to [be]	29
8	the problem seem to [be]	15
9	the problem seems to [be]	13
10	the problem have to [be]	8
11	the problem [be] to [be]	8
12	the problem be to [be]	8
13	the problem [vb past] to [be]	6
14	the problem is to [be]	5
15	the problem appear to [be]	5
16	the problem appears to [be]	5
17	the problem [is] to [be]	5
18	the problem to [be] [vb pp]	19
19	the problem to [be] [verb]	19
20	the problem to [be] solved	7
21	the problem to [be] solve	7