Final answer:
The punctuation in the sentence is incorrect. The corrected sentence should be two separate sentences with the appropriate punctuation. The conjunction 'because' should be used to indicate the reason.
Step-by-step explanation:
The punctuation in the sentence is incorrect. The correct punctuation should be:
All my friends are doing their homework right now. I think I should too because I have a test next week.
Step-by-step explanation:
The original sentence is missing a period at the end to indicate the end of the sentence. Additionally, the second part of the sentence should be a separate sentence to stand alone. Lastly, it is advisable to use the conjunction 'because' to indicate the reason for doing the homework.
Learn more about Punctuation in English sentences