Solution:
My sister can't cook.
Can you do it yourself?
Who can answer this question?
She can never come to the meeting on time.
Will you be able to help me tomorrow?
Yesterday he couldn't fall asleep.
Can you drive a car?
Can I visit you tomorrow?
Why couldn't you solve this problem?
Mom says I won't be able to come tonight.
Where can I buy tickets?
You can't think about it all the time.
She could swim as far back as last year.
Were you able to find him yesterday?
Sorry, but I couldn't come yesterday.