Betty and Lingling are writing postcards.（对划线部分提问提问）划线部分are

Betty and Lingling are writing postcards.（对划线部分提问提问）划线部分are writing postcards
My father is enjoying the afternoon tea at home now.(对划线部分提问）画线部分为at home
Becky is talking to her mother on her cell phone.(对划线部分提问）划线部分为Becky
He doesn't doing his homework now.(改错）
The students are waiting of their teachers.(改错）
Thanks for give me the nice postcard.(改错）