Objective Explanation:
This worksheet aims to help students practice and distinguish between the Past Simple and Past Perfect tenses in English. By completing the exercises, students will enhance their understanding of the correct usage of these tenses in different contexts.

Content Overview:
The main focus of this worksheet is on the Past Perfect tense. Students will be required to put verbs in the Past Perfect form based on the provided sentences. This exercise will help students grasp the concept of actions that occurred before a certain point in the past and distinguish them from actions in the simple past.

Language and Educational Level Context:
Designed for students learning English as a Second Language (ESL), this worksheet is suitable for intermediate level learners. The content and language used are tailored to meet the needs of students at this proficiency level, allowing them to practice and refine their skills in using the Past Perfect tense accurately.

Subject Relevance:
This worksheet aligns with the broader ESL curriculum by focusing on a specific grammar point - the Past Perfect tense. Understanding and using this tense correctly is essential for effective communication in English. By mastering the distinction between Past Simple and Past Perfect, students can enhance their language proficiency and fluency.

Instructions:
The instructions provided in the worksheet direct students to put verbs in the Past Perfect tense in the given sentences. For example, in the sentence "They (eat) before he arrived," students are prompted to change the verb "eat" to its Past Perfect form. Similarly, the question "What (she do) that upset him so much?" requires students to apply the Past Perfect tense to the verb "do." Through these examples, students are guided to practice and differentiate between the Past Simple and Past Perfect tenses effectively.