[Nouns ・Adj.] ~ is okay
(even if) ~ is alright to
(even) ~ can・may
Structure
- いAdjective[く] + てもいい
- Noun + でもいい
- なAdjective + でもいい
What’s the grammar point that explains the から usage in this example? It’s not a てから, and I thought a sentence ending with から is supposed to be the cause of the following (or elided) sentence, but that would be “{I will do [it]} because {it’s fine that it’s summer vacation}”. That doesn’t seem to make sense here.
“It is even fine …” sounds really weird. Shouldn’t it be rather “it’s fine, even if …”?
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Hey and welcome to the community forums 
@Shinzo
I have changed the translation to:
" It is fine if you like to do sports."
I think it sounds much better in English, what is your opinion?
Thank you for the feedback!
Cheers,
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高くてもいい。
What is the reason for changing the い for く in 高い ?
Isn’t it changed only to form negative sentences?
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That’s the correct pattern. 
Here’s the positive and negative conjugations of い-adjectives.
高い → 高くて
高くない → 高くなくて
Adjective[て]・Noun[て] | Japanese Grammar SRS
なくて | Japanese Grammar SRS
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What’s the “てもよろしい” form mentioned in the quiz answers? I assume it’s another form, but it’s not mentioned in the lesson info at all.
よろしい is a more polite alternative to いい with more or less the same meaning.
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