Present modal + be + -ing
Use present modal
continuous when speculating or deducing if an action is being done or being planned to take an action in the future.
2.- Past Modal
Continuous
Past simple modal
+ be + -ing
Use past modal
continuous when you are not sure if the subject is doing an action.
3.- Modal Perfect Continuous
3.1.- I could
have been relaxing at home if I didn’t have to work today.
3.2.- They should
have been doing their homework at the time that I called.
3.3.- He would
have been working at that company if he hadn’t been laid off.
3.4.- You might
have been thinking I was much older.
Modal verb + have
been + -ing
Use perfect modal continuous talk about an ongoing situation that began in the past but continuous in the present in relation to speculation or deductions.
Conversation video about the modal verbs of speculation and deduction
1. Where might you be living in the year 2030?
2. What could you be doing next Saturday afternoon?
3. What must most of the people in China be doing right now?
4. What should all of the students in this class be thinking about now?
5. When might the sun be shining continuously every day in Seattle?
6. What could you be doing right now if you weren’t taking a lesson?
7. What might your relatives be doing in your home country right now?
8. What could you be doing if you were in your native country?
9. What might you be doing at this time a year from now?
10. What may your best friend be doing right now?
12. How long must you be taking ESL classes?
13. When could you be watching television?
14. How
long must you have been taking lessons today?
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