de particle #2: 地

This de particle probably isn't used quite as much as the other two, but it tends to be a bit easier for English speakers to understand. 地 is called 土也地 (tǔyě de) in Chinese, again because those are the components that form the character. Note that whilst 地 is pronounced dì for other uses, when used as a particle it's pronounced de.

地 behaves very much like the suffix  -ly  in English. That is, it marks adverbs, or converts adjectives into adverbs. Some examples:

慢慢地

mànmande

slowly

准确地

zhǔnquède

correctly

好心地

hǎoxīnde

kindly

And some full example sentences:

他很快地吃饭。

Tā hěn kuài de chīfàn.

He eats quickly.

他很有希望地看着我。

Tā hěn yǒu xīwàng de kànzhe wǒ.

He looked at me hopefully.

你应该小心地处理这件事。

Nǐ yīnggāi xiǎoxīn de chǔlǐ zhè jiàn shì.

You should deal with this issue carefully.

Notice how 地 can convert whole verbal phrases (很有希望 and 小心地) into adverbs in the example sentences above.