I am writing two paragraphs about two themes but I can't think of two conclusion sentences.

The themes are friendship and sacrifice. Help please? Thanks

Conclusion sentences simply sum up the main ideas in your paragraphs.

http://lklivingston.tripod.com/essay/intro.html

Ok, I think I got it. Also, does sacrifice mean "given up"?

Yes, sacrifice can mean given up.

http://dictionary.reference.com/browse/sacrifice

Certainly! Here are two possible conclusion sentences for your paragraphs on friendship and sacrifice:

1. In conclusion, friendship serves as a powerful force that has the capacity to uplift and support individuals through life's challenges, making it an essential theme in literature and human experiences.

2. To sum up, sacrifice is a poignant theme that reminds us of the profound acts of selflessness and love that individuals are capable of, leaving a lasting impact on both the characters within literary works and the readers who empathize with them.

When crafting a conclusion sentence, it's important to consider the main points you have made in the paragraphs and restate them in a concise yet impactful manner. Also, try to leave the reader with a sense of closure or a final thought that reflects the significance of the theme you have discussed.