Петя, должно быть, заболел, иначе о

Петя, должно быть, заболел, иначе он был бы уже в театре, он никогда не приходит в последний момент.

Results (English) 1:

Peter must be ill, or he would have been in the theater, he never comes up at the last moment.

Results (English) 2:

Peter must have been ill, otherwise he would have been in the theater, he never comes at the last moment.

Results (English) 3:

Petya, should be, fell ill, otherwise it would already have been in the theater, he never comes at the last moment.