how can i combine this sentence to make one sentence? Do you have the time? Do you wear a watch?

Do you wear a watch and could tell me the time?

You don't always have to use every word you are given in order to combine sentences. As long as the main idea(s) are still there, you can take away and add words and still be telling or asking the same thing.

writing in math explain how you can use a hundred chart to subtract 12 from 46

Can you tell me the time on your wristwatch?

To combine the two sentences "Do you have the time?" and "Do you wear a watch?" into one sentence, you can use the conjunction "and". Here's the combined sentence: "Do you have the time and wear a watch?"