Vântul este puternic acum.

In Romanian the definite article (“the”) is attached to the end of the noun, not a separate word.
• vânt = “wind” (indefinite)
• vântul = “the wind” (definite; -ul is the masculine-singular definite article)

Use the free (indefinite) article un before the noun, and place the adjective after:
• un vânt puternic = “a strong wind”

Romanian adjectives normally follow the noun when they’re attributive, and in predicative position (after este) they function as complements. So in
• vântul este puternic
the adjective puternic (“strong”) naturally comes after the verb.

Adjectives must match the noun in gender and number.
• vânt is masculine singular → adjective takes the masculine-singular ending, which is zero here: puternic
If it were a feminine noun (e.g. apă “water”), you’d get apă puternică.

acum = “now” (adverb of time). Romanian adverbs are relatively flexible:
• at the end: Vântul este puternic acum.
• at the start: Acum vântul este puternic.
• before the adjective: Vântul este acum puternic.
All mean “The wind is strong now,” with only slight focus shifts.

Yes/no question: invert subject and verb or just use intonation.
• Este vântul puternic acum?
• Vântul este puternic acum? (rising intonation)
Negation: insert nu before the verb.
• Vântul nu este puternic acum. (“The wind is not strong now.”)

• â (same as î) is a central vowel [ɨ], somewhat like an “uh” sound.
• Pronounce vântul roughly as [vɨn-tul], with the stress on the first syllable: VÂN-tul.

Absolutely. In colloquial speech este often contracts to e.
• Vântul e puternic acum.
sounds fully natural in conversation.