Tu dois faire attention à ne pas effrayer la grenouille.

Questions & Answers about Tu dois faire attention à ne pas effrayer la grenouille.

Why are ne and pas right next to each other before effrayer?
Normally, ne and pas wrap around a conjugated verb. However, when making an infinitive (unconjugated) verb negative, both parts stay together directly in front of the verb. That is why ne pas sits as a single block right before the infinitive effrayer.
Why is the preposition à used just before the negative verb?
The French expression for "to pay attention to" or "to be careful" is faire attention à. When you are being careful "not to do" something, the à stays in place to link the expression directly to the negative infinitive.
Why doesn't ne drop its 'e' to become n' since effrayer starts with a vowel?
Elision (changing to an apostrophe) only happens when ne is placed directly next to a vowel sound. Because the infinitive rule forces ne and pas to stay together, the word right after ne is pas, which starts with a consonant.
Could I say Tu dois faire attention de ne pas effrayer instead?
No, because faire attention requires the preposition à when followed by a noun or a verb. You will see de used after other similar verbs (like essayer de or décider de), but with faire attention, you must always use à.

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