I have ordered for a cup of tea
I have ordered a cup of tea
Which one is correct and why?
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You order something for someone or something. You don't order for something for someone or something in English. That doesn't sound idiomatic. For example:
I ordered a cup of tea for you.
I ordered a printer and twenty reams of A4 paper for the office.
I ordered for a cup of tea sounds like you placed an order for a cup of tea as though it were a living thing that was interested in receiving something from you, which is really just pure nonsense.
However, note that if the word order is used as a noun, then you most certainly can use it with the preposition for:
We received an order for a cup of tea.
I placed an order for a printer and twenty reams of A4 paper.