Say chief. Notice ch / ie / f: five letters represent three sounds in this word. The middle is i then e. Look, cover every model, write the word on paper, then uncover and compare each letter. Repair a mistake and try again. This is not a rule for every English word.
Worked example
The fire chief checked the map. Chief names the leader. Spell it c-h-i-e-f, not cheif.
Write before choosing
Cover the word in the title, instructions and picture. Ask a helper to say the word for a leader. Write it from memory, then check. Write a sentence using the word. A helper checks your writing separately; the questions below check choices, not unaided spelling or handwriting.