<span>A) We cannot walk alone.
I would also recommend that next time you put some spaces between the question and answers next time, it makes it very hard to read. </span>
Here are the answers to the given question above.
The given word is "begin". The present participle would be beginning. The past form is began, and the past participle is begun. The word begin is one of the irregular verbs. Hope this answers your question. Have a great day!