不能去海边游泳让他觉得很失望。

Bùnéng qù hǎibiān yóuyǒng ràng tā juéde hěn shīwàng.

Not being able to go to the beach made him feel disappointed.

他在第一次约会迟到了一小时，让我觉得很失望。

Tā zài dì yī cì yuēhuì chídào le yì xiǎoshí, ràng wǒ juéde hěn shīwàng.

He was an hour late to our first date, which made me very disappointed.

我对这次的考试结果感到很失望。

Wǒ duì zhè cì de kǎoshì jiéguǒ gǎndào hěn shīwàng.

I'm so disappointed in the results of my test this time.