Answered By: Writing Center
Last Updated: Nov 05, 2015     Views: 0

Used to do and used to doing mean two very different things. Don't interchange them. 

In the sentence, I used to jog here every morning, speaker jogged here a lot every morning but not anymore.

In the sentence, I am used to doing three full jog turns in this track, speaker is in the habit of doing three full jog turns in the track because he has been accustomed to do so for quite a time.

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