Example: Clue: money

Example: This is a book.
Method: The words 'a', 'an' and 'the' are articles. Find the article and select it.
Answer: In the above sentence the article 'a' is used. Therefore, the answer is 'a'.

Example: I am reading.
Method: Find the verb phrase, then figure out the action word. Select the word in the verb phrase used before the action word.
Answer: The verb in the above sentence is 'reading' and 'am' is the helping verb. Therefore, the answer is 'am'.