Mother promised to take me out to expand sentences.

"Mom promised to take me out" is a simple sentence. In order to expand this sentence, you can add more details and information to describe the situation, time, place and so on. Here are some possible extensions:

-Last night, I asked my mother to take me out shopping. To my surprise, my mother promised me happily.

This afternoon, my mother suddenly came to my room and told me that there was a surprise: she decided to take me out to dinner to celebrate my excellent report card.

My mother promised to take me to visit the newly opened science and technology museum in the coming weekend. I am very excited about this, because I have always loved technology and new inventions.

My mother will take me and my family on a trip this holiday. She made a detailed travel plan, including scenic spots, transportation and accommodation. We are all looking forward to this trip.

These extended sentences make readers understand the situation and reasons of the incident more clearly and make the sentences more concrete and vivid.