Hi ! Nina.

Hello there!

Oh, I am sorry to know that you are sick.

Take your medicines on time and do not forget to eat nutritious food!

Anyways, do not forget to capitalize your words if necessary.

See you!

Good morning!
>> CORRECT!

>> A pleasant morning!
sorry, Nina.

>> Sorry, Nina.

>> I am late.

I didn\'t forget your suggestion.
>> CORRECT!

>> OR: I did not forget what you said.
I was horribly sick last week and I\'m still taking medicine.
>> CORRECT!

>>OR: I was horribly sick last week and I\'m still on medication.

But I feel better than last week so I can study English with you today.
>> Fortunately, I feel better now so I can study English with you today.
Have a nice day!

>> CORRECT!

>> OR: May you have a nice day, Nina!

Nina. and take care.

>> Take care.