I've just come back from a holiday in the United States

　　我剛從美國(guó)度假回來(lái)。

　　May I ask where you come from?

　　請(qǐng)問貴處。

　　I am always tired when I come home from work.

　　我下班回家時(shí)總是很疲倦。

　　I come from China, a beautiful city!

　　我來(lái)自中國(guó)，一個(gè)美麗的.城市！

　　I come from a world full of life!

　　來(lái)自充滿鮮活生命的世界！