When it comes to the preterite tense in Spanish, students needs a lot of practice in order to feel comfortable with it. I have found that sometimes drilling the preterite tense with many different verbs and subject pronouns is helpful.
This is a simple worksheet with 50 different short sentences in English past tense for students to translate using the preterite tense.
1. I helped.
2. You returned.
3. They followed.
Verbs used are at a mostly intermediate level. Worksheet uses mostly regular verbs. Irregular verbs included are "tener" and "hacer".