"That is a big wall, it must have cost a fortune." Would this sentence be grammatically correct or should it be two separate sentences? Thanks in advance for any help on this.
desk candle should it be two separate sentences? Yes, it should. Whenever you have two independent clauses joined only by a comma, it's wrong.
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desk candleshould it be two separate sentences?
Yes, it should. Whenever you have two independent clauses joined only by a comma, it's wrong. To fix these you can add a conjunction like 'and', 'but', or 'or', or you can substitute a semi-colon for the comma.
That is a big wall, it must have cost a fortune. (Wrong)
That is a big wall,