Vul in: can, could, can't of couldn't.
1. ..... you help us sir? No, I ..... , I am very sorry. But I am sure Fred ..... help you.
2. She ..... swim nowadays since she is healthy again, but one year ago she still ..... .
3. I regret that I ..... do it back then.
Uitwerking
1. Could you help us sir? No, I can't , I am very sorry. But I am sure Fred can help you.
2. She can swim nowadays since she is healthy again, but one year ago she still couldn't .
3. I regret that I couldn't do it back then.