Look at the sentences:
Nous sommes en train de décorer la chambre du bébé en ce moment-même.We are decorating the baby's room right now.
In French, there is no equivalent tense for the English Continuous Present (I'm doing) .
Le Présent (e.g. "Je vais") is used for both the Present tense ("I go...") and the Present Continuous ("I'm going...")
However, when you really want to emphasise the progression of the action, you can use the expression "être en train de" + infinitive (literally 'to be in the process of')
Also see Être en train de : expressing ongoing actions in the past
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