Hello,
1. He must be very tired. He's been working all day long.
2. He should be very tired. He's been working all day long.
I have to fill up the gap with a model verb.
Are both the modal verb possible?
hanuman_2000 Are both the modal verb possible? Yes.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.