This program has fallen into an infinite loop.

Calculating infinite series is one of the more difficult parts of mathematics.

She is planning a date with her current boyfriend.

He lost everything.

My boyfriend gave me a gift.

Everyone was surprised by the news.

His single word triggered a chain reaction, and everything changed.

The theory of Markov chains is an important part of probability theory.

The ecosystem of this lake heavily depends on a specific food chain.

He likes to take a walk in the park at dusk.