Question

Though his mother tongue is tamil but he always speaks in English
Error spotting
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Answer 1

but

The error in the sentence is the use of the word 'but'.

We omit the word 'but' even though the first and second parts of the sentence are contradictory; because of the word 'though'. This is because when you employ the word 'though' in a sentence, there is no need to use the word 'but' in such a sentence with contrasting parts.

The correct sentence is:

Though his mother tongue is Tamil, he always speaks in English.