肯定句
She is sleeping.
They are playing football.
否定句
Tom isn't watching TV now.
一般疑问句
Are they playing football？
例句
Mary enjoys listening to classical music.
Peter has finished doing his homework.
Do you mind opening the window？
Alice sat at the table.
这些句子展示了主语加系动词加动词ing形式的不同用法，包括肯定句、否定句、一般疑问句以及作为伴随状语的用法。希望这些例子对你有所帮助。
