be to be expected

be (only) to be expected

To be typical or unsurprising. Unfortunately, post-surgical pain is to be expected. That type of contemptuous reaction is only to be expected from such a cretin.
See also: expect

be (only) to be exˈpected

be likely to happen; be quite normal: A little tiredness after taking these drugs is to be expected.‘I’m afraid I’m very nervous.’ ‘Don’t worry, that’s only to be expected.’
See also: expect