Loose vs. lose

Loose (locker, lose) = not tight, not attached. “These trousers are too loose.”
Lose (verlieren) = to no longer have something, or not win. “Don’t lose your keys again.”

💡 Think of it this way:
Loose has two O’s, like it’s got extra room. Lose has one O – something’s missing.

Remind vs remember

Remind  (erinnern an/jemanden erinnern) = when someone or somethinghelps you remember.
“Can you remind me to buy milk?” (Kannst du mich daran erinnern, Milch zu kaufen?)

Remember (sich erinnern) = when you recall something yourself.
“I remember my very first English lesson.” (Ich erinnere mich an meinen ersten Englischunterricht.)

💡 Think of it this way:
Remind = needs two people or things
Remember = only needs one

Sympathisch vs. sympathetic

Sympathisch (sympathisch) = likeable, pleasant to be around. “Mein neuer Kollege ist total sympathisch.” 
Sympathetic(verständnisvoll, mitfühlend) = understanding, compassionate. “My manager was very sympathetic when I explained my situation.

💡 Think of it this way:
Sympathisch = you like being around them. 
Sympathetic = they understand how you feel.