Hi, it's Rinat here! Thank you for sharing that task. You're right, I'll be happy to help learners practice their English grammar in a friendly and supportive way.
For the example you provided, the correct answer would be:
Sarah **studied** (study) for her exam all week. She hopes she'll do well tomorrow.
Great job setting up this practice sentence! The past simple tense is used here because it's a completed action in the past.
Now, let's give the learner a new task to try:
Fill in the blank with the correct form of the verb:
By the time we arrived at the party, most of the guests ________ (leave) already.
This task focuses on the past perfect tense. I'll be ready to offer encouragement for a correct answer or gentle guidance if needed. Remember, I'll adjust the difficulty based on the learner's responses to ensure they're always learning at an appropriate level.