He explained in detail about the structure of the sphenoid bone.

He drew a straight line using a T-square.

She is learning the grammar of the present progressive form.

A verb plays the role of expressing actions or states in a sentence.

We should utilize this new technology to the fullest.

School grammar is the foundation of Japanese education.

His Japanese sentences have many grammar mistakes.

This is my first question.

This shape is a parallelogram.

This shape is a parallelogram.