Auxiliary Verbs

This is a review on Auxiliary Verbs - do and does and did. We usually auxiliary verbs in interrogative and negative sentences. Let's see the auxiliary verbs. 

Present Simple

Auxiliary Verbs
Do and Does

We use do and does to express a routine or habits.

Simple Past 

Auxiliary Verbs
Did

We use did to express an action that finished in the past in a specific time in the past.

Let's compare:

Do you work on weekends?  Yes, I work on weekends. No, I don't work on weekends.
Did you work last weekends? Yes, I worked on weekends. No, I didn't work on weekends.

In the first sentence you talk about  your routine.
In the second sentence you talk about an action that finished in the past in a specific time in the past.

Exercises: Fill in the blanks using do, does or did

________ travel to Europe last year?
________ he work on Sundays?
________ she play the guitar last weekend?
________ you play the piano?
________ she travel to Miami last weekend?

Fill in the blanks using negative sentences (don't, doesn't or didn't):

They _______ like Italian food.
She ________ work last weekend.
She ________ smoke.
They __________ have a BMW.
He _________ like sports.
They _________ speak German.