I eat breakfast in morning.
>> I eat breakfast in the morning.
Explanation: Let's make your sentences better by adding an article on them.

I watch TV in Sunday.
>> I watch TV on Sunday.
Explanation: Let's be careful on using preposition in our sentences. We use "on" for exact date or exact name of the day. We use in "in" if the date is not specific or exact.

I practice karate in night.
>> I practice karate at night.
Explanation: Be careful on using preposition.

COMMENT:
Hi Emma! Thank you for sending me your homework. Let's talk about this grammar rules next meeting. For now you did a great job in your homework keep it up Emma!
-Teacher Joanna