Example: The cat chase the rat.
Method: Figure out if the subject is singular or plural. Then, find the verb. If the subject is singular then the verb must also be singular. If the subject is plural, then the verb must also be plural.
Answer: In the above sentence, 'cat' is singular. So the verb "chase" must also be singular. Therefore, the answer is 'chase'.

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'.

Example: She is in my team.
Method: Figure out which word is a name given to a group of people, places or things and select it.
Answer: The noun in the above sentence is 'team'. Therefore, the answer is 'team'.

Example: pay back or to return a favor

Example: to pay in advance

Example: He told the truth.
Method: Figure out the noun which is a quality that you can only think and feel about. Then, select it.
Answer: The noun in the above sentence is 'truth'. Therefore, the answer is 'truth'.

Example: This is John.
Method: Figure out which word is the name of a particular person, place or thing and select it.
Answer: John. John is the name of a particular person. Therefore, it is a proper noun.