29/06/16 The Meaning of ‘SOUND’
Sound is a copular verb (like feel, look, smell etc.). It is followed by adjectives, not adverbs.
You sound unhappy. What’s the matter?
Progressive forms (-ING) are not very common.
Your idea sounds great. (NOT
Your idea’s sounding great.)
However, progressive forms are possible when there is an idea of change.
The car sounds/is sounding a bit rough these days.
Sound is often followed by like or as if.
That sounds like Bill coming up the stairs.
It sounds as if she’s had a hard day.