One of the beauties of learning Chinese is that they don’t have any past tense, which makes it so much easier to learn. Instead of conjugating verbs, they simply put a ‘le’ (了) after the verb. For example, “I eat food” is written as “我吃饭, Wǒ chī fàn”. However, if you say “I ate food yesterday”, the Chinese will simply say “我昨天吃了饭, Wǒ zuótiān chīle fàn‘.