First, both sentences are wrong because you didn’t start them with a capital letter and end them with a period.
I knew that this [color=red]was going to happen.
If the verb in the main clause is in the past tense, the verb in the subordinate clause usually has to be in some sort of past or perfect tense.
He didn’t even [color=red]tell me to sit.
The auxiliary verb did should be followed by the base form of the next verb, so said was wrong in the past tense. Said was also the wrong verb. If someone is ordering another person to do something, he tells that person to do it.