Question

he can swim across the river.( change into yes/no)​

Answer 1

Answer:

Can he swim across the river?

Explanation:

Commonly there are two types of questions used in English.

They are:

1. Wh-questions

2. Yes/No questions

Here, Yes/no questions are discussed below:

• These type of question answers the question either in 'Yes' or in 'No'.
• While forming Yes/No questions, the verbs like auxiliary verbs(do, be, have) and modal auxiliary verbs(can, could, shall, should, might, may, must, will, would) are used. It's impossible to form such types of questions without using these verbs.
• The structure of Yes/No question is Auxiliary/Modal verb + subject + main verb + Object.
• The main verb should be always in present form.
• Some examples of Yes/No questions are:

              ⇒Are you a doctor?

              ⇒ Does she play football?

               ⇒Can he fly an airplane?

Links with informations on Auxiliary and Modal auxiliary verbs

https://brainly.in/question/5195982
https://brainly.in/question/1352849