Yes, though it is possible to consider was going to swim as 'the (BE) going-to future form' of swim.What are the verbs in "I heard him say that he was going to swim tomorrow." ? "heard", "say", "was", "going" and "to swim" ?
If you have a question about the English language and would like to ask one of our many English teachers and language experts, please click the button below to let us know: