SN4 ""

No	Pattern	Freq
1	[noun sg] have been to keep	5
2	[noun] have been to keep	5
3	have been [verb] to keep	50
4	have been [adj] to keep	49
5	have been [adj] to keep	47
6	have been [vb pp] to keep	38
7	have been able to keep	22
8	have been able to keep	22
9	have been [v-ing] to keep	12
10	have been unable to keep	7
11	have been unable to keep	7
12	have been tell to keep	6
13	have been told to keep	6
14	have been trying to keep	5
15	have been try to keep	5