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The past tense of did is did. The present tense of did is do. The future tense of did is will do.
"Has" is in present tense. The past tense is "had".
Choose is the present tense of chosen.
Example:
"Today, I choose to live my life to the fullest."
The present participle of flow is flowing.
Faithful is an adjective, it doesn't have a present tense.