Question

I have to rewrite this following sentence replacing the direct object nouns with direct object pronouns.

Elle monte l'escalier.

How would you do it???

Answer 1

First of all, learn the direct-object pronouns in French:
me, te, nous, vous (you don't have to really distinguish between direct or indirect-object pronouns here because in French those 4 look alike. It is 3rd person singular and plural which can cause trouble:
le, la (l' before a vowel or unsounded h ), les

The direct object is l'escalier. Knowing that it is masculine singular, it will be replaced with "le" so t he sentence is: Elle (subject) le (direct object) monte. (verb)

That will give you the word order for an affirmative sentence = subject + direct-object pronoun + verb.
Negative or interrogative sentences are a bit different.

Sra (aka Mme)