call sb的用法及短语

　　He called on them that evening.

　　他那天晚上去拜访了他们。

　　I called upon Mrs Foster this evening.

　　我今晚去看望了福斯特太太。

　　Please call me a taxi.

　　请帮我叫一辆出租车。

　　Then the teacher called on me to answer the question.

　　这里老师叫我回答问题。

　　We are calling on you to help us.

　　我们恳请你帮助我们。