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While so Since so When so If so
are having; will start will be having; starts have; will start will have had; starts
Should, should have done Shall; may have done Must, should do Must, should not have done
Oh, I’m afraid I didn’t cook very well I’m glad you enjoyed it Come again when you are free It’s not necessary for you to say so
problems facts chances cases
valuable present convenient comfortable
While so Since so When so If so
Should; must not have done Shall; may have done Must; should do Must; should not have done
While so Since so When so If so
Oh, I’m afraid I didn’t cook very well I’m glad you enjoyed it Come again when you are free It’s not necessary for you to say so
I’m glad you enjoyed it Oh, I am afraid I didn’t cook very well Come again when you are free It’s not necessary for you to say so