What is the Present form of must?

There is no present form of "must" in the same way that there are present forms for regular verbs like "walk" (walk, walking, walked).

"Must" is a modal verb, and it doesn't change its form to indicate present tense. It is always "must" whether you're talking about the present, past, or future.

Here's how to use "must" in different tenses:

* Present: "I must go to the store."

* Past: "I had to go to the store." (This is the past tense of "must")

* Future: "I will have to go to the store."