A. I was working
B. I had been working
C. I will be working
D. I have been working
🧠 Explanation:
The sentence “I am tired as I have been working since morning” uses correct tense. For English students, this highlights verb tenses, making it a key topic for studying grammar, linguistic accuracy, and sentence structure. Tenses ensure clarity. Understanding this improves grammatical precision. It’s essential for mastering language rules in communication. Studying tenses offers insights into how language conveys time, crucial for English, journalism, and communication.
