You can only be sure of _____ you have at present; you cannot be sure of something _____ you might get in the future.
— Do you feel like taking a walk in the park? — ____.
— You’ve won the football game. Congratulations! — ____.
— I’m so sorry for stepping on your foot. — ____.
— Where is Tom this morning? — He’s got a cold. — ____
— My children are always arguing. — ____