Relative clauses make your English more fluent. Instead of two short sentences, you can make one longer, more connected sentence. 'I work with a woman. She manages the accounts team.' becomes: 'I work with a woman who manages the accounts team.' 'The system stopped working. We use it every day.' becomes: 'The system that we use every day stopped working.' 'I visited an office. It had no desks.' becomes: 'I visited an office that had no desks.' Practice combining sentences — it is one of the best ways to sound more natural in English.

💡 Did you know? Latin, which is the ancestor of Spanish, French, and Italian, had six different relative pronouns depending on grammatical case. English simplified this dramatically — which is one reason English is relatively easy to start learning.