I left out these sentences on modals. Thank you, Writeacher.

1) It is likely that she has forgotten about the meeting. She may/might/could/should have forgotten about the meeting (are both “possibility” and “probability” included??)
2) I’m very unsure if I will pass my English test. I might not pass my
3) I’m supposed/expected to work this weekend. I should work this weekend.
You are to stay here until I return. You must stay here…
4) It is probably too cold to go to the beach. It should/ought to be too cold to go to the beach
5) He is likely to visit us tonight/He will probably visit us tonight. / Maybe he will visit../Perhaps he will visit…. It is likely that he will visit us… He should visit us tonight.

1) It is likely that she has forgotten about the meeting. OK

She may/might/could have forgotten about the meeting. (are both “possibility” and “probability” included??) Those three possibilities are correct; "should," however, means there's an obligation to do something.

2) I’m very unsure if I will pass my English test. I might not pass my ...
OK

3) I’m supposed/expected to work this weekend. I should work this weekend. OK

You are to stay here until I return. You must stay here… OK

4) It is probably too cold to go to the beach. It might/could be too cold to go to the beach.

5) He is likely to visit us tonight/He will probably visit us tonight. / Maybe he will visit../Perhaps he will visit…. It is likely that he will visit us… all OK

He should visit us tonight. This also means there's an obligation, not just a possibility.

Sure! Here are the missing sentences with modals and some alternative expressions:

1) It is likely that she has forgotten about the meeting. She may/might/could/should have forgotten about the meeting.

Explanation: To express possibility and probability, you can use modals like may, might, could, or should. In this context, all of these modals convey the idea that there is a chance she has forgotten about the meeting.

2) I'm very unsure if I will pass my English test. I might not pass my English test.

Explanation: Here, "might not" indicates a possibility that you won't pass your English test. It suggests uncertainty about the outcome.

3) I'm supposed/expected to work this weekend. I should work this weekend.
You are to stay here until I return. You must stay here...

Explanation: In the first sentence, using "should" implies an obligation or expectation that you work this weekend. Similarly, in the second sentence, using "must" indicates a strong obligation or directive to stay here until the person returns.

4) It is probably too cold to go to the beach. It should/ought to be too cold to go to the beach.

Explanation: "Should" and "ought to" in this context imply an expected outcome. They suggest that based on the circumstances, it is likely to be too cold to go to the beach.

5) He is likely to visit us tonight/He will probably visit us tonight. / Maybe he will visit../Perhaps he will visit.... It is likely that he will visit us... He should visit us tonight.

Explanation: These sentences express the likelihood of someone visiting, using various expressions. "Likely" and "probably" indicate a high probability, while "maybe," "perhaps," and "will" suggest possibilities. Finally, "should" implies an expectation or belief that he will visit tonight.