Complete the sentences. Use can, can’t, could or couldn’t. 1. Now she ___ exercise for an hour.
2. She also lost five pounds. Now she ___ wear a skirt
3. I ___ go to the library yesterday because I went to the dentist,
4. ... but I ___ go later today.

1. Now she can exercise for an hour. Explanation: This sentence is talking about the present ability of the person to exercise for an hour, so we use the modal verb "can" to show capability. 2. She also lost five pounds. Now she can wear a skirt. Explanation: This sentence is talking about a change in the person's ability to wear a skirt. Previously, she might not have been able to wear a skirt, but now she has lost weight and can do so. Therefore, we use "can" to express the new ability. 3. I couldn't go to the library yesterday because I went to the dentist. Explanation: This sentence is talking about a past event. The person couldn't go to the library because they had an appointment with the dentist. We use "couldn't" to indicate the inability to fulfill the action in the past. 4. ... but I could go later today. Explanation: The missing part of this sentence suggests that the person might have the opportunity to go to the library later today. Since it is a possibility in the future, we use the modal verb "could" to indicate the potential ability to go.