（1）、The boy has been to the U.S.A. twice.（对划线部分提问） How has the boy been to the U.S.A.?
（2）、Mom felt tired after she cooked for the whole family.（改为简单句） Mom felt tired after for the whole family.
（3）、Mr. Brown and his wife have been married for 20 years. （改为同义句） Mr. Brown and his wife 20 years ago.
（4）、Lisa didn't hang out with her friends yesterday. （改为肯定句） Lisa out with her friends yesterday.
（5）、Some reporters are interviewing a government official on traffic problems now.（改为被动语态） A government official is by some reporters on traffic problems now.
