Set 1.

1. She must have been worried.
2. She must be worried.

Set 2.

1. You can’t say that.
2. He can’t have said that.

Set 3.

1. I could have been on time if I got up earlier.
2. I could be late tomorrow.

Set 4.

1. John might do it.
2. John might have done it but I’m not sure.

Set 5.

1. She may have known that it wasn’t true.
2. She may know that it’s not true.

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