Breaking the offending sentence into two sentences is grammatically correct but often rhythmically wrong.
My apologies if the tenses in the preceeding sentence are grammatically incorrect.
In principle, the more correct way to speak is the way that we should write—in complete sentences, grammatically correct, etc.
And, judging by the titles, they're not written by the most grammatically proficient users.
grammatically this is incorrect, for is certainly the predicate; but for the elucidation of the meaning this may be disregarded.
How, it may be replied, can we with propriety say, grammatically incorrect?
Professor said the novel seemed to him very light and trashy, but grammatically O.K.
It is not every man in your walk in life who can write as grammatically as you have dreamed.
"Yes, it's me," he said, more cheerfully than grammatically.
grammatically, line 72 is an example of the absolute construction, common in Latin.