His house is very clean. I respect him. I'm going to clean my house like him.
His hobby is to exercise. His hobby is exercise. I also want to be good at exercise  = execising.

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Hi Se Yun! Good job on your homework. ;) I can see that you're imroving a lton your sentences. :D Keep up the good work! I hope that you had a good day today. See you later ^^

~Teacher Lady ^.^~