Elle est rationnelle et tu l'es aussi.

Questions & Answers about Elle est rationnelle et tu l'es aussi.

Why is there an l' in tu l'es? Doesn't "you are too" translate to just tu es aussi?
In English, we can drop the adjective and just say "you are too." French grammar doesn't allow leaving the verb être (to be) without its complement like that. You must use the neuter pronoun le (which contracts to l' here) to replace the previously mentioned adjective rationnelle. Literally, it's like saying "you it are too."
Since rationnelle is feminine, shouldn't the pronoun be the feminine la?
No, because the pronoun here is replacing an adjective, not a specific noun. When replacing an adjective or a general state of being, French always uses the invariable neuter pronoun le. It never changes to agree with the gender or number of the subject, although here it contracts to l' because es starts with a vowel.
Can I drop the l' in casual spoken French and just say et tu es aussi?
No, the neuter pronoun is mandatory even in casual speech. French requires a complement for the verb être in this context, so you cannot leave it out.
Why does rationnelle end with a double L?
This is a quick spelling refresher: adjectives that end in -el in the masculine (like rationnel) must double the l and add an e to form the feminine. Since the subject here is Elle, the feminine form rationnelle is required.

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