first form vs base form

Hello all, I am studying CELTA at the mo and have been giving a question - is there a difference between first form and base form and infinative- I know infinitive is To +base form but am unsure if base form and first form are the same any help would be great thanks...

Mr unsure

[Tdol]

They're the same. Bare infinitive is also used, just in case you were running short of unneceesary jargon. :mad: