第1个回答 2015-06-23
向朋友请教是必要的
It's necessary to ask friends for teaching/help
第2个回答 2015-06-22
It's necessary for you to ask help from your friend.
第3个回答 2015-06-22
it's necessary to ask friends for help in study.
第4个回答 2015-06-22
It's necessary to ask a friend for advice.
第5个回答 2015-06-22
It is necessary to consult friends.