|Cum ipso sum in tribulatióne.||I am with him in tribulation.|
Cum ipso = with him. Cum is a preposition which takes the ablative case, and means with.
sum = I am. Recall God’s words to Moses, in Exodus 3:14, “Ego sum qui sum. Ait : Sic dices filiis Israël : Qui est, misit me ad vos.” / “I Am Who Am. He said, Thus speak to the sons of Israel : He who Is, sent me to you.” And its fulfillment in John 8:58, “Dixit eis Jesus : Amen, amen dico vobis, antequam Abraham fieret, ego sum.” / “Jesus said to them, Amen, amen I say to you, before Abraham was, I am.”
in tribulatione = in tribulation. The thing to note with the preposition in is whether the word attached to it is in the ablative or the accusative case. In + accusative case implies physical or moral motion, while the ablative case does not.