At the moment, the pattern is
Lib Dem 52
So the Conservatives do not really have the seats needed to form a workable minority government. Equally, the only genuinely likely coalition partners - Labour and the Lib Dems - do not have enough between them (yet?) to form a parliamentary majority.
The only partnership that gives a workable majority is Conservative/Lib Dem, but that requires the two most widely separated parties to work together in a way that Dave has ruled out.