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Peut-être le satellite a-t-il découvert une nouvelle planète.

Peut-être le satellite a-t-il découvert une nouvelle planète.
Perhaps the satellite discovered a new planet.
From Lesson 309:Inversion after initial adverbs (peut-être, sans doute)·French

Questions & Answers about Peut-être le satellite a-t-il découvert une nouvelle planète.

Why is there an -il after the verb when the subject is already le satellite?
This is called complex inversion. When a sentence starts with certain adverbs like Peut-être, formal French requires subject-verb inversion. Since the subject is a noun (le satellite) rather than a pronoun, you keep the noun before the verb and add the matching pronoun (il) right after the verb.
What is the purpose of the -t- in a-t-il?
It is added purely for pronunciation. When you invert a verb ending in a vowel (like a) with a pronoun starting with a vowel (like il, elle, or on), French requires you to insert a -t- to prevent the two vowels from crashing together.
In the passé composé, why does the inversion only happen with a and not the whole verb a découvert?
In compound tenses, only the conjugated auxiliary verb (here, a) is inverted with the pronoun. The past participle (découvert) always stays in its normal place after the inverted auxiliary and pronoun.
Do I always have to use this complex inversion when starting a sentence with Peut-être?
In formal and written French, yes. However, in everyday spoken French, you can easily avoid it by adding que after the adverb. For example, you could say Peut-être que le satellite a découvert une nouvelle planète, which allows you to keep the normal subject-verb word order.
Just a quick refresher, why is nouvelle placed before planète instead of after?
Nouvelle is one of the common adjectives that follow the BANGS rule (Beauty, Age, Number, Goodness, Size). As an adjective describing age or newness, it naturally comes before the noun it modifies.

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