Begin a simple past tense sentence with a noun. Nouns are people, places or things. The noun should be the entity who completed the past tense action.
Conjugate the verb to the past tense.
Add an auxiliary verb if necessary. In the case of past tense sentences, this is usually "did," a conjugation of the verb "to do."
Add an adverb to modify the verb, if necessary. Adverbs often end in -ly.
Read your sentence aloud to make sure that it makes sense. If you are not a native English speaker, check the correctness of the sentence by reading it to someone who is.