Question

I believe you to be a true friend (change into complex sentence)​

Answer 1

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I believe that you should be a true friend.

Explanation ↴

We have to use a noun clause to make it Complex as we know that a group of words which contains a subject and predicate of its own and does the work of a noun is called a Noun Clause. Here, I used the linker 'that' with the noun clause.

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Answer 2

☘Answer :-

I believe that you should be my true friend.