ask, beg, demand, implore, inquire, request, require 区别

Ask: 一般情况下“问”（往往期望答复）；要求；ask for请求； ask after 问候 
eg. The teacher asked me about my study.

Beg：请求（一再要求的意思）
eg.The children begged not to be left home.

Demand：要求（积极用语；强硬的、断然的口气）demand of sb.
eg.He demanded a dictionary of me.
   She demanded a room all to herself.

Implore： 要求（乞怜，表示非常迫切、焦急的要求）
eg.The prisoner implored the king for mercy.
   He implored forgiveness for what he had done.

Inquire：问，打听（inquire of ab.; inquire at someplace）
eg.He inquired of me the best way to study English.
   I’ll inquire at the office and then tell you the time.

Request：要求，恳求（较正式而又客气的用语；下对上或平级的“要求”）
eg.They requested more help.
   We request the favour of a reply at your earliest convenience.

Require：要求（require of sb.;sth. require doing = require to be done）有时指上对下的“要求”。
eg.The task requires of us still greater efforts.
   The windows require repairing.
   = The windows require to be repaired.
   The court required that he should pay the fine.