— You           your ideas at the meeting in a different way. --- Thank you, but I was too angry then.

I ______ tell you with certainty that he won’t be able to finish it before the deadline. 

Since nobody gave him any help，he ________ have done the research on his own.

---Did they have a good time at the party?---Judging by their smiles, they _________ have enjoyed themselves.

She _____ your birthday party, but she had to look after her mother in hospital．