Hi, here you are more online practice on the Modal Perfects to speculate about the past:
Exercise 1 (multiple choice overview)
Exercise 2 (gap-filling overview)
Exercise 3 (another gap-filling drill)
Exercise 4 (do you know when to use the modal + infinitive OR the modal + have + participle? Check it out there! Remember: is the sentence set in the present or in the past?)
Finally, here you are an exercise (with keys) of should (have+part.) to express regret.
Do them as many times as possible to nail them!
