They can swim (改为一般疑问句）还有一句He often helps his mother do the housework(改为同义句）

they can swim 改为疑问句 i can swim(改为一般疑问句) They can swim in the river.(改为否定句） I can swim in the river 改为一般疑问句 I can swim.改为一般疑问句,作否定回答 I can swim(改为一般疑问句,并作肯定回答) My friend can swim well.(改为一般疑问句) My friend can swim well改为一般疑问句 The ducklings can swim in the pond.改为一般疑问句 Kitty can swim well改为一般疑问句并肯定回答 they can swim 变一般疑问句和否定句 She can swim 改为一般疑问句并作否定回答She can swim 改为一般疑问句并作否定回答 They can swim (改为一般疑问句）还有一句He often helps his mother do the housework(改为同义句） they can play football改为一般疑问句 they can play basketball (改为一般疑问句) They can make cars改为一般疑问句 They can swim 对划线提问 swim THEY CAN SWIM VERY FAST.