In this article I point out that rather than two, as is commonly thought, or indeed one, which is an old idea recently revived by some scholars, Aquinas in fact presents three main senses of being: (A1) being as actus essendi or esse or ‘present actuality’; (A2) being as (real) form or essence; (B) being as the reply to the an sit? (is there…?) question or anitas or ‘there is’ sense. Regarding the relations among these three senses of being I (...) show that: (i) the same logical treatment holds for the form (B) and (A2), since both can and need to be re-written in the form: something is so-and-so (whereas the same process cannot be applied to the A1 sense of being); (ii) the relation between the A1 and A2 senses of being is not a mere relation between distinct elements, but rather a relation among different stages of a single process, namely that between first and second actuality; (iii) the relation between the A (1 and 2) and B senses of being seems to be one of grounding, since the ‘there is’ sense seems to Aquinas to be grounded on the present actuality sense of being as an effect to its cause. (shrink)