The professor said that I had to learn those words regularly.
The professor said that I had to learn those words regularly.
The professor said I should learn these words regularly.
The professor said I should learn these words regularly.
The professor said that you had to learn these words regularly.
The professor said that you had to learn these words regularly.
The professor said that I must learn those words regularly.
The professor said that I must learn those words regularly.
Correct Answer:
The professor said that I had to learn those words regularly.
The professor said that I had to learn those words regularly.