[Present Perfect] (Brazilian studying english) Whats the difference between these sentences.?

Isa is very smart and always has the correct answer, but her teacher has asked her to hold back her answers so that other students can have a chance AND without the word HAS Isa is very smart and always has the correct answer, but her teacher asked her to hold back her answers so that other students can have a... show more Isa is very smart and always has the correct answer, but her teacher has asked her to hold back her answers so that other students can have a chance

AND without the word HAS

Isa is very smart and always has the correct answer, but her teacher asked her to hold back her answers so that other students can have a chance.

We don't have something like present perfect in portuguese, so it's kinda hard to get it! Tks.
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