According to the grammar rules you should write A portion of ... is (not are ) As for the portion of students it sounds odd. I suppose it would be better to write: A group of students ...
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As for the portion of students it sounds odd. I suppose it would be better to write:
A portion of ... is(not are)
And as for WERE/IS - it is incorrect question as were is Past Tense of to be and it isplural whe
A group of students ...