Tell or told

tell present, base form

told past

I always tell you the truth.

I told you the truth yesterday.

Question and negative sentences use the proper form of do and then tell.

I didn't tell you the truth yesterday. Did you tell me the truth yesterday? Do you always tell the truth?

My teacher told me a simple way to answer this question

When you have an auxillary verb with a verb, then the aux. verb will take on the tense/plural and singular aspect of the verb.

so when you have do+tell do will take on the past tense and tell will remain in its base form.

example: He does understand the question.

He understands

Anonymous what did i tell you or what did i told you

He does this every time when "I tell" or "told" him to take me at home?!

Anonymous what did i tell you or what did i told you

I told you.

What did I told you

anonymous what did i tell you or what did i told you

What did I told you