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a. When I was a child, my mother taught me say thank you, holding the door for others, and to cover my mouth when yawning or coughing.
b. When I was a child, my mother taught be to say thank you, to hold the door for others, and to cover my mouth when yawning or coughing.
c. When I was a child, my mother teaching me to say thank you, to hold the door open for others, and cover my mouth when yawning or coughing.
B. When I was a child, my mother taught be to say thank you, to hold the door for others, and to cover my mouth when yawing or coughing.