I don't believe it is incorrect to use the infinitive, but the gerund sounds better to me, even with the double ing .
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Anonymousmy question is: can a continuous tense be followed by a gerund??Yes, but there is often an easy way to reword the sentence if you want to avoid this.
Anonymous"I'm always practicing drawing" Why use the continuous form if you are talking about what you "always" do? or I should