Ask与Ask For：
●ask v. 问，询问；请求，要求，邀请
ask问一个问题
ask sb a question 问某人一个问题
I asked (Mary) a question.
ask sb.to do
They asked Tony to sing a song.
他们让Tony 唱一首歌。
They asked her to spend the weekend with them.
他们要求她和他们一起渡周末。
●ask for 要，要求（某样东西）
ask for the answer 要答案
I asked for a cup of coffee, but they gave me a cup of tea.
我要了一杯咖啡，但他们给了我一杯茶。
You are always asking for help.
你总是要求帮忙。
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