What is grammatically wrong in this phrase: ¿Como se construye una pregunta en español?

'Como' should be spelt as 'Cómo'. Although these two words are pronounced the same way, the accent added in the correct version changes the meaning of como so that it means 'how' in English, rather than 'such/as'. This is the same with all question words in Spanish, such as qué, por qué, and dónde to name a few.