Question 1

Why is termina in the indicative mood rather than the subjunctive?

Accepted Answer

In time clauses starting with cuando (when), we use the indicative mood for things that happen regularly or are general facts. Because this sentence describes a general biological fact about what an insect always does, termina is in the indicative. We would only use the subjunctive (termine) if we were talking about a specific insect finishing its phase in the future.

Question 2

Why do we use se convierte en for 'becomes' instead of another verb like se pone or se hace?

Accepted Answer

Spanish has several ways to say 'to become' depending on the situation. Convertirse en is used for a major physical change or a complete transformation into something else, like an insect changing its biological form. Ponerse is for temporary physical states or moods, and hacerse is often for changes requiring personal effort, like a profession.

Question 3

Do we always need the preposition en after convertirse?

Accepted Answer

Yes, when convertirse means 'to become' or 'to turn into' a noun, it must be followed by en. You can think of it literally as 'converts itself into'.

Question 4

I remember that primero sometimes drops its last letter. Why is it primera here?

Accepted Answer

Primero only drops its final letter (becoming primer) when it comes directly before a singular masculine noun. Because fase is a feminine noun, the adjective takes its regular feminine form, primera, and doesn't drop any letters.

El insecto se convierte en un adulto cuando termina la primera fase.

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