—Can we run across the road now?—No, we _     . We have to wait until the light turns green.

---Do you know why Anna hasn’t come to school today? ---I’m not sure. She _______ be ill.

 Some people ________ not have plans yet for New Year’s Eve, but others know exactly what they will be doing.

You have a big mouth, Li Fei. You ________ have told everybody the secret.

If you ______ smoke, please go outside.