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has taught was teaching taught had been teaching
had taught; president has taught; the president taught; president has been teaching; the president
that; that that; and which; that that; which
had taught taught is teaching has been teaching
is teaching taught has taught will teach
taught has taught had taught has been teaching
had taught is teaching taught has been teaching
ours, She our, He us, He us, She
had taught has taught taught has been teaching
had taught taught is teaching has been teaching
taught has taught had taught has been teaching
is teaching taught has taught will teach
has taught taught had taught teaches
had taught has taught taught has been teaching
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