The house that has a red roof is mine. - This sentence is -

• Complex sentence:
- যে sentence এ একটি Principal clause এবং এক বা একাধিক Subordinate clause থাকে, তাকে Complex sentence বলে।
- Complex sentence এর subordinate clause এর শুরুতে সাধারণত if, though, although, as, because, since, so that, that, until, till, unless, when, why, who, which, where, how, before, after, whether, while বসে।

যেমন:
- The house that has a red roof is mine.
- After finishing his homework, Tom played video games with his cousins.
- Even though she was tired, she stayed up late to finish her project.