He seems to be sleeping,为什么有个be?sleep为什么加ing?

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Heseemstobesleeping,为什么有个be?sleep为什么加ing?Heseemstobesleeping,为什么有个be?sleep为什么加ing?Heseemstobesleepin

He seems to be sleeping,为什么有个be?sleep为什么加ing?
He seems to be sleeping,为什么有个be?sleep为什么加ing?

He seems to be sleeping,为什么有个be?sleep为什么加ing?
句型.sb seems to do sth