Understand the major difference between the particle は(wa) and が which is one of the hardest concepts to overcome in the beginner level of Japanese language.
Explain the usage of wa and ga via PowerPoint presentation with sample sentences.
It is often confusing to use proper particle when starting a sentence in Japanese. Please watch the video below and understand one way to distinguish the difference between は and が.
One more function of が that you need to be aware of is "however," and "but" function. When が is placed at the end of the first predicate, it adds "although," "though," "however," or "but" meaning. For example:
わたしは アメリカじん ですが、にほんに すんでいます。Although I'm an American, I live in Japan.
えいごの せんせいは きびしいですが、クラスは たのしいです。Although English teacher is strict, her/his class is fun.
Simplified explanation (means there are many, many other ways of は and が）of knowing the difference between the particles は and が for beginner level in Japanese language.
For additional particle practice, go to the link below and fill in the blanks with different particles. By Texas A&M.