地 (de) serves as a suffix to turn an adjective into an adverb or functions as a content word meaning ground, floor, or land.
地 (de) is a particle added to an adjective to transform it into an adverb. Therefore, it is very similar to the English suffix
adjective + 地 + verb
Here are some examples:
When an adjective has only one syllable, it should be repeated twice in the adverb transformation. For example, 慢 (màn) is a monosyllabic adjective, so in order to turn it into an adverb, 慢 (màn) is doubled into 慢慢(mànmàn) before 地 (de) is added. Therefore, ‘slowly’ is 慢慢地 (mànmàn de) instead of 慢地 (màn de).
We should keep in mind that 地 is not just used as an adverbial particle. It can function as a noun with the meaning ground, floor, or land. When used this way, it is pronounced as dì. Let's have a look at some examples:
Let's practise with the following example - try to guess which 地 is which without looking at their pinyin!