Let's look at each question and its options one by one to understand the correct choice:
Is Pam at the gym?
a. No, she's having lunch with a friend.
b. No, she has lunch with a friend.
The correct answer is a. No, she's having lunch with a friend. This sentence uses the present continuous tense "she's having," which is appropriate because it indicates an action happening right now. The present simple tense in option (b) would imply a regular habit, which doesn't fit the context of a specific event.
How often do you go swimming?
a. I usually go every morning.
b. I'm usually going every morning.
The correct answer is a. I usually go every morning. This choice uses the present simple tense "I go," which is suitable for stating routines or habitual actions. Option (b) uses the present continuous "I'm usually going," which isn't appropriate here since it describes ongoing actions happening at the moment, not regular habits.
Is Javier telling the truth?
a. No, I'm not believing him.
b. No, I don't believe him.
The correct answer is b. No, I don't believe him. This option is correct because it uses the present simple tense "I don't believe," which fits when expressing opinions or beliefs. Option (a) uses "I'm not believing," which is not standard in English for expressing disbelief.
Each answer uses the appropriate verb tense to correctly convey the meaning of the sentence in context. Remember that the present continuous tense describes actions that are currently happening, while the present simple tense is used for habitual actions or states of being.