Noun:
* Her understanding of the problem was crucial to finding a solution. (direct object)
* A deep understanding of history is essential for good citizenship. (subject)
* Through hard work and dedication, she gained a greater understanding of the complex subject. (object of the preposition)
Adjective:
* The professor gave an understanding explanation, which helped the students grasp the concept. (modifying a noun)
* They were an understanding family, always willing to lend a helping hand. (modifying a noun)
* We had an understanding that we would keep our conversation private. (modifying a noun)
Verb:
* I understand your frustration with the situation. (present tense)
* The doctor understood the severity of her illness. (past tense)
* She understood the assignment perfectly, and completed it without any errors. (past tense)
Gerund:
* Understanding different cultures is important for a successful global society. (subject)
* She found understanding her own emotions to be a challenging but rewarding process. (object of the preposition)
Other Phrases:
* I have a good understanding of how this machine works. (idiomatic expression)
* We need to reach a mutual understanding before we can move forward. (idiomatic expression)
* She was understanding of his limitations and offered her support. (adjective phrase)
The specific way you use "understanding" will depend on the context and your intended meaning.