seems / seemed - does seem / did seem

[altiwife]

Are these expression totally equivalent:
it seems as if... = it does seem as if...
it seemed as if... = it did seem as if...

 

[emsr2d2]

[STRIKE]Are[/STRIKE] Do these expressions [STRIKE]totally equivalent[/STRIKE] mean the same?

"It seems as if..." and "It does seem as if..."

"It seemed as if..." and "It did seem as if..."

See above.