The ducks were swimming in the pond, and1. the cows were gazing peacefully.

On how to memorize things, there are several ways, although certain ways only work for certain types of learners.

One way is to create flashcards. Flashcards are very effective.
Another way is to use quizlet. Quizlet is my favorite option, and I use it often.
You can also use pseudonyms or acronyms or something, such as PEMDAS, which stands for the Order of Operations in mathematics.