Please someone tell me how can we use "used to" correctly. What type of words can be followed by this phrase. I mean, which of the following sentences are correct?
I used to to do that.
I used to doing that.
Please note that I wanted to talk about some practices that I did in the past but not doing at the moment.
The "used to" that you refer to is always followed by a verb infinitive. "I used to do that" is therefore correct, while "I used to doing that" is incorrect. Note, however, that "I was used to doing that" is correct.
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The "used to" that you refer to is always followed by a verb infinitive. "I used to do that" is therefore correct, while "I used to doing that" is incorrect. Note, however, that "I was used to doing that" is correct. This is a grammatically different use of "used to". "used to" is a tricky phrase for learners because it can be used in several different ways.