making an offer - shall I open a window?, explessing advice - You should open a window., making a polite request - Do you mind if I open the window?, expressing willingness - I'll open the window., expressing annoyance - You could have opened the window., expressing inhability - You couldn't open teh window., expressing obligation - NO MATCH, expressing deduction - You must have opened the window., Expressing certainty - I bet you opened the window., Expressing speculation - He might have opened the window.,

language functions English teaching

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