I'm having a strong debate with my girlfriend about this one, so I need your help, note that we're not native english speakers.
Basically, I have the following sentence: "Did they saw that?", the context of my question was to determine if her friends have seen a picture that I sent her in the past.
So, which one of these is correct and why?
- Did they see that?
- Did they saw that?
She keeps telling me about how you have to use the infinitive form of the verb when you use Past Simple, but I keep telling her that if we're talking about the past it's okay to use the second form. Some help?