句型转换 1. Sam's mother comes from the USA.(改为一般疑问句并作肯定和否定回答) _________ Sam's mother _________ from the USA? Yes, she __________./No, she ________. 2. Her cousin lives in Singapore.(改为否定句) Her cousin _________ _________ in Singapore. 3. Jim and Sam are from America.(改为一般疑问句并作肯定和否定回答) — _________ Jim and Sam________ America? —Yes, they _________./No, they _________. 4. My mother's favorite country is Australia .(对划线部分提问) _________ your mother's favorite country?