grammatically

"The teacher's answer was correct. "

"I gave him a good grade for effort."

"Maria is earning good grades in math by studying hard every day. "

"My son is studying grammar in his English class. "

"The pupil wrote his name on the paper."

"Your writing is not grammatical enough for publication."

"The student answered the math problem correctly. "

"The upcoming school field trip concerns all the students in Grade 5. "

"The perfect tense, used to describe actions completed before another time, is a useful grammatical tool. "

"My history essay explored the causes of the French Revolution. "

"My sister learned to write in a very careful manner. "

"My sister is always driving me crazy."