Learn French: Cette étude est intéressante, alors quelle est votre conclusion ? - This study is interesting, so what is your conclusion?

Yes, you could! Both words show a consequence. However, alors is very common in everyday speech and is often translated simply as 'so'. Donc can sometimes feel slightly more formal, closer to 'therefore', though they are frequently interchangeable at this level.

The word étude starts with a vowel. Why do we use cette instead of cet?

Because étude is a feminine noun. The special demonstrative form cet is only used for masculine nouns that start with a vowel or silent h (like cet homme). For feminine nouns, you always use cette, no matter what letter they start with.

Why is there an 'e' at the end of intéressante?

In French, adjectives must match the gender of the noun they describe. Since the adjective is describing cette étude (a feminine noun), we add an 'e' to the default masculine form intéressant to make it agree.

Why is the question word quelle instead of quel?

The word for 'what' or 'which' has to agree with the noun it asks about. Here, it is asking about your conclusion, which is a feminine word. So, we double the 'l' and add an 'e' to the masculine quel to create the feminine form: quelle.