Used before beginning a meal. Literally means "I will receive."
ごちそうさま。
Used upon finishing a meal. Literally means "It was a feast."
おなかが いっぱいです。
I am full.
い Adj. + くて、 Sentence 2。
When conjoining a sentence ending with an い adjective with another sentence, the final い of the adjective of the first sentence is dropped, replaced by くて and attached to the next sentence.