・assign:割当てる

She is assigning him several jobs to do.

They have been assigned a lot of homework.


・expire:期限が切れる

He signed the new contract when the old one expired.

Milk should be drunk before it expires.


・acknowledge:認める、気づいたことを示す

The company acknowledged their hard work with an award.

He is not even acknowledging her presence.
彼は彼女がそこにいることすら無視している


・implement:実施する、実行する

He is explaining how the company will implement the new strategies.

They are diciding how to implement the changes to the plans.