Hemos estudiado temas muy interesantes este semestre.

Questions & Answers about Hemos estudiado temas muy interesantes este semestre.

Why do we use hemos estudiado here instead of the simple past tense?
In Spain, when an action happens in a time period that isn't over yet, we use the present perfect tense. Because the timeframe este semestre (this semester) is still ongoing, we use hemos estudiado. If the sentence was about last semester, which is a finished timeframe, we would use the simple past tense (estudiamos) instead.
Temas ends in an "a", so why is it a masculine noun?
Tema is one of several Spanish words of Greek origin that end in -ma but are actually masculine (like el problema, el idioma, and el sistema). Because it is a masculine noun, you will always use masculine articles like el or los with it.
Does the adjective interesantes change its ending based on gender?
No, because the singular form interesante ends in an -e. Adjectives ending in -e or a consonant use the exact same form for both masculine and feminine nouns. Since temas is plural, we just add an -s to make it interesantes.
Why is it este semestre and not esto semestre?
Semestre is a masculine singular noun, and the word for 'this' in front of a masculine singular noun is always este. The word esto is a neutral pronoun used when talking about an unknown object or a general idea, and it is never placed directly in front of a noun.

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