Where did my comb go?

She combed her hair with a comb.

He made a presentation at an international conference, making excellent use of his English.

Yakitori is skewered and grilled.

Mr. Kushi is my best friend.

He sent me a 'kushi' (slang for a short message or information).

He excels in the ability to command English.

He made excellent use of that opportunity to fully demonstrate his abilities.

My grandmother has weak sight, so it's difficult for her to read small letters.

It's difficult to decipher this chemical equation.