They are relaxing at home.这里为什么用relaxing,而不用 relaxed?

They are relaxing at home.这里为什么用relaxing,而不用 relaxed? They are relaxing at home. 这里的relaxing是动词吗 They are ( ) at home.A.relax B.relaxing C.relaxes D.relaxed there is a relaxed smile on his face.为什么用relaxed?不用relaxing? They’re relaxing at home this weekend they're relaxing at home中文 relaxed relaxing relaxed & relaxing They (are relaxing) at home.画括号部分提问 ____ ____ they ____ at h they （are relaxing） at home.对括号提问 ____ ____ they ____ at hom They are ( )at home( )this sunday.A relaxing；forB relax;toC relaxing 与relaxed