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

　　我剛從美國度假回來(lái)。

　　May I ask where you come from?

　　請問(wèn)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，一個(gè)美麗的.城市！

　　I come from a world full of life!

　　來(lái)自充滿(mǎn)鮮活生命的世界！