They ___ have arrived at lunchtime but their flight was delayed.
-------How are you today ?--------Oh, I ______ as ill as I do now for a very long time .
She ____ on her way to school. I just phoned her home and got no answer.
--- Why haven’t you bought any bread?---- I ____ to but I forgot about it.
Every time I see her at her home, she ____ hard in her room.
---- Did he write the article for the newspaper?--- He ____ not have finished it, for he was sick and in hospital all the time.