We use subject questions when we are asking about who, what, etc. did the action. We do not use an auxiliary verb after the question word if the question word (
When we are asking about the object (after the verb) we use the normal order of the English question:
Jack called Teresa. (Teresa = object) | Jack called Teresa. (Jack = subject) |
---|---|
Who did Jack call? (Who = object) | Who called Teresa? (Who = subject) |
In informal or spoken English, when a question word needs a preposition, the preposition goes at the end of the question (after the verb or after verb + object if there is an object). We don’t use the preposition at the beginning.