Well, after was/were you usually use either the present participle (progressive aspect) or the past participle (passive voice), as in:
He was selling.
It was sold.
It is also possible to use the infinitive as in:
He was to sell the house. (this one is about a plan/ arrangement)
Or even a perfect infinitive as in:
I was to have started work last week, but I changed my mind. (a planned event did not happen)
An important remark, SG:
if you use "did" then the main verb should NOT be in its present form!
It should be in the infinitive, or otherwise you will get something like "*He did goes."
I suppose you confused the names.
Rgds,
cairn