читать is imperfective—it describes an ongoing or habitual action (“is reading” or “reads regularly”). The perfective counterpart is прочитать, which focuses on completion (“to read through,” “to have read”).
Example: учёный прочитает книгу means “The scientist will (successfully) read the book (to the end).”
Pronunciation (IPA): [uˈt͡ɕɵnɨj t͡ɕɪˈtajet ˈknʲiɡu f bʲɪblʲɪɐˈtʲekʲɪ].
Transliteration: Uchyonyy chitayet knigu v biblioteke. Note that ё always indicates stress and is pronounced “yo.”
Use the question word где (where):
Где учёный читает книгу?
Answer: В библиотеке (“In the library.”)
• Feminine: учёная (ending -ая)
• Plural (all genders): учёные (ending -ые)
After that, they decline like adjectives/nouns of the same pattern.