Review PI Units 1-6
Choose the correct modal verb (must, have to, should, may/might): They ... not have time to visit us tomorrow.
They may/ might not have time to visit us tomorrow.
Choose the correct modal verb (must, have to, should, may/might): People ... take care of nature.
People must take care of nature.
Choose the correct modal verb (must, have to, should, may/might): You ... (not) go with us if you don't want to.
You don't have to go with us if you don't want to.