Learn French: Il travaille dans une grande entreprise.

In French, regular verbs that end in -er (like travailler, to work) have their own set of endings. For the "he" (il), "she" (elle), and "we/one" (on) forms, you drop the -er and just add an -e. So, il travaille is perfectly correct without an "-s"!

How do you pronounce the -ille part of travaille?

In French, the combination -ill- (when preceded by a vowel) usually makes a "y" sound, exactly like the "y" in the English word "yes". So, travaille sounds roughly like "tra-vai-y", without an "L" sound.

Why does grande come before entreprise? I thought French adjectives go after the noun.

You are right that most French adjectives go after the noun! However, a small group of very common adjectives goes before the noun. A common trick to remember them is the acronym BANGS, which stands for Beauty, Age, Number, Goodness, and Size. Since grande (big) describes Size, it goes before the noun.

Why is there an "e" at the end of grande?