Hello there Woojung,

Thank you for submitting your homework, I'm happy to know about your weekend activities. I hope you enjoy your weekend. Please check and take notes of my corrections. See you on Wednesday..^_^

Correction:

I usually go to the Grandpa and Grandma's house on the weekend.

Correct: I usually go to Grandpa and Grandma's house on weekends.

**The word "the" is not necessary to this sentence.

When I don't go to Grand's house, I usally play, watch TV, or sleep more on the morning.

Correct: When I don't go to grandparent's house, I usually play, watch TV, or sleep in the morning.

** Use "Grandparent" to mean the parent of someone's mother or father.
** Be careful with the spelling of the word "U-S-U-A-L-L-Y".
** We use "in" during a period of time.

I often go out with my family to eat dinner or go to hike.

Correct: I often go out with my family to eat dinner or to hike.

** Avoid repeated words in a sentence to not to sound redundant.