Final answer:
You can revise the first sentence by beginning with a phrase, such as 'In a clearing near the riverbank, we set up camp.' To revise the second sentence, you can begin with a clause, like 'Since we knew the wilderness could be dangerous, we always traveled in groups.'
Step-by-step explanation:
To revise the sentence by beginning with a phrase, you can say 'In a clearing near the riverbank, we set up camp.' This phrase can be used as an introductory phrase to provide context before the main subject and verb.
To revise the sentence by beginning with a clause, you can say 'Since we knew the wilderness could be dangerous, we always traveled in groups.' This clause adds a dependent clause at the beginning of the sentence, providing a reason for the action.