Practice the target tense in clear everyday contexts. Each sentence has one correct verb form. Note: Because apostrophes can sometimes cause technical matching errors, it is better to use the full form when completing the gaps. If you use a shortened form, both the straight apostrophe (') and the curly apostrophe (’) are accepted.
Complete each sentence with the correct English verb form. Use the hint in parentheses. For negative answers, the full form and the short form with either a straight or curly apostrophe are accepted.