Ο Τομ δεν μπορούσε να καταλάβει γιατί η Μαίρη είχε λάβει εκείνη την απόφαση.

English Translation

Tom couldn’t understand why Mary had made that decision.

The verb “πάρει” is more commonly used in spoken Greek, while “λάβει” is more formal and often used in written Greek.