He is very tall. - CORRECT

Yanghyeon: I don't drink it often.

Correct: I don't drink juice often.

Explanation: It could be better if you indicate the thing that your talking about so that it could be more clear and easy to understand.

I'll be done at eight o'clock. -  CORRECT

Yanghyeon: I do not like watchman.

Correct: I don't like to be a watchman. 

His fate is in my hand. - CORRECT

 
Yanghyeon: I need a break from routine.

Correct: I need a break from my routine.

You did a good job Yanghyeon, I'm impressed to do homework that you've submitted your now becoming mindful with the words that you'll use in your sentences. Keep up the good work.^___^

Teacher Lyn^^