talk- talked- (I) was talking- (I) have talked- (I) have been talking- do not talk
walk- walked- (I) was walking- (I) have walked- (I) have been walking- do not walk
go- went- (I) was going- (I) have gone- (I) have been going- do not go
smell- smelt sau smelled- (I) was smelling- (I) have smelt- (I) have been smelling- do not smell