Synonyms of invaluable is inestimable
Then is used here as adverb
Preposition is used to make relation of words
They ran directly to their college.
Concern تشویش
Anxiety بے چینی
We use on when we think of a place as a surface or if a thing is placed in contact.
Put this painting on the well.
Inherit
دبا لینا
Leaveچھوڑو
On as preposition used for date and day
