He need worry about the weather today.
He needs worry about the weather today.
Mostly we see the use of 'need' as modal verb in negative or interrogative sentences where it takes bare infinitive with it. But when the word 'need' is used as a verb, it takes infinitive with it. I found these two statements in a question paper which perplexed the learners much. Which one is the correct statement and what is its constitution with reference to grammar rules?