1. I decided (buy / to buy) a book.
2. I cannot afford (buy / to buy) a car.
3. I helped my mother (do / to do) housework.
4. Remember (do / to do) your homework.
附表是一些小學常見跟 to-infinitives 配搭的生字，學生在測驗和考試時要多加注意呀！
圖片來源： “Tenses and Proofreading Elite” Book 6, published by Kidz Education