ask偏向“问”
1.May I ask a question?
我可以问一个问题吗?
2.I have asked some friends for tea.
我请了一些朋友来喝茶.
3.Did you ask the price?
你问价钱了吗?
ask for偏向“要求”
1.The people ask for political asylum.
人们请求政治避难.
2.B:You should ask for a refund.
你应该要求退款.
3.What more could they ask for?
他们还想怎么样?