The Japanese words たくさん and 多（おお）い have similar meanings, but their usage differs. 多（おお）い is an adjective, while たくさん is an adverb and a noun. In addition, たっぷり is an adverb that means "plenty." The particle は is used for emphasis, while を is used to mark the direct object of the sentence. When talking about quantity, using たくさん is more appropriate than ずいぶん. Additionally, the particles は and が differ in emphasis, with が drawing attention to the words before it and は focusing on other information in the sentence. Similarly, the phrase 前に/は is used to indicate time or location, with の前に/は being used before verbs and nouns, respectively. And finally, through the writer's study abroad experience, they have learned the nuances of using these words and particles correctly.