how would i combine these sentences using compound subj. and verbs?
They use it to produce the energy they need. your muscles need alot of oxygen. you should relax. you should move only as much as necessary. with these techniques you can train yourself to stay underwater for up to four minutes.
Circle the words that are repeated in most of the sentences. For one, there's the word "you" which can be the basis of sentence combining.
Are you clear on what a compound subject or a compound verb is? Here's a sentence with a compound subject:
Jack and Jill went up the hill.
Here's a sentence with a compound verb:
Henry ran and jumped all the way home.
Be sure to repost when you have those sentences rewritten. Then someone here will be able to give you feedback.