Tiger: Hardcover books can be clunky and take up lots of space. Therefore, not all books are easily stored.

Mickey: My sister is on the varsity volleyball team. In order to qualify for the team, players must take a concussion course at the school or online. My sister has never taken an online course. Therefore, she must have taken the course at the school.

Fat Cat: My brown boots are missing from my closet. When my sister left the house earlier, she giggled and rushed like she does when she has something of mine she took. I believe she has taken my brown boots.