Questions have a few nuances when it comes to their grammatical structure, which could be confusing if you try to analyse them using the methods we've developed over the previous lessons in this series.
But the differences really boil down to just a few rules, which we'll explain here just so you can see how they work:
1. The 'question word' always goes just before the verb group.
- Who ate the cake?
- What did Mimi eat?
- Where did Mimi eat the cake?
- Last night, how did Mimi eat the cake?
No matter what question we ask, the question word always comes before the verb group. Usually that means the question word will come right at the start of the sentence (but if a sentence has any modifiers—like "last night" in that final example—those can sneak in front).
2. The 'question word' fills the same clause component slot as the 'answer' would.
This is a little bit theoretical, but it will help explain the third 'rule' (to come).
If we answered the questions above with a statement, we can see that the 'question word' is standing in for the word group that is the 'answer':
- Who ate the cake?
Mimi ate the cake.
- What did Mimi eat?
Mimi ate the cake.
We can go one step further and say that the 'question word' is filling the same clause component slot.
The 'subject':
- Who ate the cake?
- Mimi ate the cake.
The 'complement':
- What did Mimi eat?
- Mimi ate the cake.
Or a 'modifier':
- Where did Mimi eat the cake?
- Mimi ate the cake in the kitchen.
3. The verb group gets split up when the 'question word' is not the 'subject' of the clause.
You've probably noticed something strange about some of these verb groups.
What did Mimi eat?
Where did Mimi eat the cake?
How did Mimi eat the cake?
It kind of looks like there are 2 verb groups in each question. which would normally mean there are 2 clauses. But really there's still only 1 verb group; it's just been broken up and the tense (shown by the tense helper, 'do') has swapped places with the subject, "Mimi".
This doesn't happen when the 'question word' is the subject:
Who ate the cake?
As we already saw, 'question words' always go in front of the verb group, so when the 'question word' is the subject, we can't do the swap!