1. Tā niànguo zhèngzhixüé. 他/她念过政治学。 He/she has studied political science. Cueduó jiǔ 多久 how long Tā niàn zhèngzhixüé, niànle duó jiǔ? 他/她念政治学，念了多久？ How long did he/she study political science? 2. Tā niànguo jīngjixüé. 他/她念过经济学。 He/she has studied economics. Cuejǐnián 几年 how many years Tā niàn jīngjixüé, niànle jǐnián? 他/她念经济学，念了几年？ How many years did he/she study economics? 3. Tā niànguo Zhōngguó wénxüé. 他/她念过中国文学。 He/she has studied literature. Cueduó jiǔ 多久 how long Tā niàn Zhōngguo wénxüé, niànle duó jiǔ? 他/她念中国文学，念了多久？ How long did he/she study literature? 4. Tā xüéguo Rìwén. 他/她学过日文？ He/she has learned Japanese. Cuejǐge yüè 几个月 how many months Tā xüé Rìwén, xüéle jǐge yüè? 他/她学日文，学了几个月？ How many months did he/she learn Japanese? 5. Tā zài kōngjǖn zuòguo shì. 他/她在空军做过事。 He/she has worked in the Air Force. Cueduó jiǔ 多久 how long Tā zài kōngjǖn zuò shì, zuòle duó jiǔ? 他/她在空军做事，做了多久？ How long did he/she work in the Air Force? 6. Tā niànguo Zhōngguo lìshǐ. 他/她念过中国历史。 He/she has studied Chinese history. Cueduó jiǔ 多久 how long Tā niàn Zhōngguo lìshǐ, niànle duó jiǔ? 他/她念中国历史，念了多久？ How long did he/she study history? 7. Tā niànguo Yīngguo wénxüé. 他/她念过英国文学。 He/she has studied English literature. Cuejǐnián 几年 how many years Tā niàn Yīngguó wénxüé, niànle jǐniàn? 他/她念英国文学，念了几年？ How many years did he/she study literature?