David is good at _______(sing).I teach______(he)_____(ride) a bike.She helps her mother_____(do) the houswork.

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David is good at _______(sing).I teach______(he)_____(ride) a bike.She helps her mother_____(do) the houswork.
David is good at _______(sing).
I teach______(he)_____(ride) a bike.
She helps her mother_____(do) the houswork.

David is good at _______(sing).I teach______(he)_____(ride) a bike.She helps her mother_____(do) the houswork.
singing
him riding
do

David is good at singing
I teach him riding a bike
She helps her mother do the housework
help 后面可以加TO DO,也可以加do ,TO省略

at是介词,介词后面用动词的ing形式。singing

singing (be good at doing 擅长做某事)
him to ride (teach sb to do sth ) sb是宾格形式 教某人做某事
do (help sb do sth )帮某人做某事