Russian modal verbs, how to say MUST and HAVE TO In Russian language

How to sa HAVE TO in Russian? There is a verb which has three gender forms нужен, нужна, нужны, нужно. This Russian verb is very similar to English modal verb have to. To use it correctly you have to remember that MUST/NEED has genders in Russian language. The formula of the structure is given in the lesson so you can use it for all the sentences with this modal verb.