No.
You need to use the indefinite article "a" if you are talking about one language.
"She spoke a different language." / "She spoke in a different language."
You would not need it if the word is plural. But you could have a number.
"She spoke different languages." (than someone else)
"She spoke several different languages."
"That was wrong" is a grammatically correct sentence.
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
Yes, it is grammatically correct.
This sentence is grammatically correct.
That sentence is grammatically correct.
"That was wrong" is a grammatically correct sentence.
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
The sentence is grammatically correct.
Yes, it is grammatically correct.
'What a drunkard you are' is a grammatically correct English sentence.
The sentence "Rhoda's Crazy" is not grammatically correct. It is missing a verb to make a complete sentence.
That sentence is grammatically correct.
Yes, the sentence is grammatically correct.
"For free' is grammatically correct. It is an idiom of the English language.
This sentence is grammatically correct.
This sentence is grammatically correct.
Yes, the sentence "his hand is filthy" is grammatically correct.