10/9/19 SOUND
Sound is a copular verb (like feellooksmell 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.