Can you find the mistakes?
Which one is it?
How good is your slang?
Are these they the same?
What's the difference?
100

I think they're new puppy is cute!

They're is the answer, it should be: their.

100

My mom said that I need to (do / make) my homework before going outside.

Do, because "do" means "solve" or "complete".

100

What does "piece of cake" mean?

It means: very easy!

100

Pronounce "hospital" in English.

It's pronounce like: jas-pi-rol

100
Is "realize" the same as "realizar"?

No, "realize" means: to become aware, and "realizar" means: to execute.

200

Cody doesn't likes to watch horror movies.

Likes, because you're using the third person auxiliary, the verb stays in simple form.

200

My girlfriend gave (me / I) a ticket to a concert.

Me, because "I" does the action, and "me" receives the action.

200

What does "break a leg" mean?

It means: good luck!

200

Pronounce "hotel" in English.

It's pronounced like: jou-teol

200

Does "actually" mean the same as "actualmente"?

No, "actually" means: in effect, and "actualmente" means: currently or now.

300

My bestie and I have gone to Canada last year.

Last year is incorrect, because that phrase is from simple past, not present perfect.
300

My co-worker (told / said) me to not share gossip with the others.

Told, because "tell" has a recipient, and "say" is general.

300

What does "hit the books" mean?

It means: to study.

300

Pronounce "doctor" in English.

It's pronounced like: dak-ter
300

Is "library" the same as "librería"?

No, "library" means: place where you rent books, and "librería" means: book store.

400

I can't do nothing wrong in life.

It can be either: "can't" or "nothing", because it's a double meaning, you need to eliminate one.

400

Hey, could I (borrow / lend) your phone charger for a bit?

Borrow, because "lend" is to give, and "borrow" is to take.

400

What does "once in a blue moon" mean?

It means: rare occasion.

400

Pronounce "impossible" in English

It's pronounced like: im-pa-si-bul

400

Is "embarrassed" the same thing as "embarazada"?

No, "embarassed" means: ashamed, and "embarazada" means: pregnant.

500
Won't you invite me to your party next month?

Won't is the mistake, since it's a question, all questions need to be in neutral, or in this case, put it as a question tag.

500

What I like to do for fun is (see / watch) romcoms and (listen / hear) to k-pop.

Listen and watch, because "hear and see" is a simple ability, and "listen and watch" is an activity.

500

What does "spill the beans" mean?

It means: reveal a secret.

500

Pronounce "video" in English.

It's pronounced like: fi-di-ou

500

Does "fabric" mean the same thing as "fábrica"?

No, "fabric" means: material for clothes, and "fábrica" means: factory.