They seemed a nice couple.
They seemed to be a nice couple.
They seemed like a nice couple.
Are they all correct?
They seemed a nice couple.
They seemed to be a nice couple.
They seemed like a nice couple.
Are they all correct?
1.They seemed a nice couple.
2.They seemed to be a nice couple.
3.They seemed like a nice couple.
Item 1 I will ignore as it is the same as item 2 as the sentence implies (to be)
2.They seemed to be a nice couple.
We use [BE] 1 to describe feelings and situations:
They seemed to be a nice couple = my feeling was, that they are a pleasant couple
3.They seemed like a nice couple.
They seemed like a nice couple. = to have a positive opinion about this couple
[Like] 2 verb [T] (ENJOY); to enjoy or approve of something or someone:
Nice is an adjective meaning ‘pleasant’, ‘enjoyable’ or ‘satisfactory’:
Therefore my answer would be; although there is a subtle difference in the choice of words the meaning is the same in all three sentences.
All references CED