Is there an infinitive of “to be” in Hebrew? If not, what to you use idomatically instead?

Sandwich asked: I learned that there are only past and future tenses of the verb “to be,” and you omit it in the present tense. For example, “Ani hayiti ba’bait” (I WAS in the house), “Ani ehiyeh ba’bait” (I WILL BE in the house), and “Ani ba’bait” (I — in the house). [...]