Wǒmen chàng le liǎng ge xiǎoshí gē.
We sang for two hours.
37. 你对什么感兴趣?
Nǐ duì shénme gǎn xìngqù?
What are you interested in?
38. 我以前在银行工作了两年。
Wǒ yǐqián zài yínháng gōngzuò le liǎng nián.
Before, I worked in a bank for two years.
39. 弟弟看了三个钟头电视了。
Dìdì kàn le sān gè zhōngtóu diànshì le.
Little brother has been watching TV for three hours.
40. 我昨天听了十几分钟音乐。
Wǒ zuótiān tīng le shí jǐ fēnzhōng yīnyuè.
Yesterday I listened to music for more than ten minutes.