I eat.

I eat it.

You do it.

I like it.

In mandarin, we will just say :

I eat. Wǒ chī. 我吃.

You do. Nǐ zuò. 你做.

I like. Wǒ xǐhuān. 我喜欢.

We understand the meaning of "it" from the context.

#Chinglish