- Jack could get to work earlier.
Answer: It's possible for Jack to get to work earlier. - Jack must get to work earlier.
Answer: It's absolutely necessary for Jack to get to work earlier. - Jack should get to work earlier.
Answer: It's a good idea for Jack to get to work earlier. - Jack needs to get to work earlier.
Answer: It's important for Jack to get to work earlier. - Jack might get to work earlier.
Answer: It's a possibility that Jack might get to work earlier. - Jack has to get to work earlier.
Answer: It's absolutely necessary for Jack to get to work earlier and someone forces him to do so. - Jack couldn't get to work earlier.
Answer: Jack's unable to get to work earlier. - Jack doesn't have to get to work earlier.
Answer: It isn't necessary for Jack to get to work earlier. - Jack mustn't get to work earlier.
Answer: It's forbidden for Jack to get to work earlier. - Jack shouldn't get to work earlier.
Answer: It isn't a good idea for Jack to get to work earlier.
Did you have a hard time understanding? Here is a quick guide to basic modal verb usage.
