Usages of hǎohāo
我们 下个 星期 有 中文 考试， 我 得 好好 准备。Wǒmen xiàge xīngqī yǒu zhōngwén kǎoshì, wǒ děi hǎohāo zhǔnbèi.
We have a Chinese exam next week; I have to prepare well.
老师 说 我们 得 好好 做 这些 练习。lǎoshī shuō wǒmen děi hǎohāo zuò zhèxiē liànxí.
The teacher said we must do these exercises carefully.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.