Examples I wanted to tell him his new shirt looked awful, but I decided to bite my tongue! I know the food's not great, but please bite your tongue and just eat it. I had to bite my tongue when my ...

Thank you for your question! 单词 “to” 的后面可以直接跟动词原形，构成不定式 “to do”，在一些情况下 “to” 还可以作介词，后面跟动词-ing。