How many word can be in a sentence with it?

There's no fixed limit to the number of words that can be in a sentence with "it." The length of a sentence is determined by the complexity of the idea you're trying to express.

Here are some examples:

* Short sentence: "It's sunny." (2 words)

* Medium sentence: "It rained heavily last night, and now the streets are wet." (8 words)

* Long sentence: "It has been proven that regular exercise improves cardiovascular health, reduces the risk of chronic diseases, and contributes to overall well-being, but many people struggle to find the time and motivation to make it a priority in their busy lives." (42 words)

The key is to focus on clarity and flow. Don't try to cram too much into a single sentence. Break down complex ideas into shorter, easier-to-understand sentences if needed.