Questions & Answers about Ce crabe est tout rouge !
Why is tout used here instead of tous?
In this sentence, tout is acting as an adverb meaning "completely" or "very", modifying the adjective rouge. When used this way, it is usually invariable (it doesn't change form). It only changes to agree with feminine adjectives that start with a consonant or an aspirated 'h'. Since crabe is masculine, tout remains in its base form.
Would rouge change if we were talking about a feminine noun?
No! Adjectives that already end in an unaccented -e in their masculine singular form, like rouge or triste, do not get an extra 'e'. They look exactly the same in the feminine.
Why is it ce crabe and not cet crabe?