Can you put "whether" at the beginning of the sentence? How to make sentences?

You can put it at the beginning of the sentence.

Make sentences:

Whether we will go there tomorrow depends on the weather.

Whether we will go there tomorrow depends on the weather.

Is it? Whether he can pass the exam is still a question.

Whether he can pass the exam is still a question.

Whether you realize it or not.

Whether you realize it or not.

Whether it is a good idea or a bad idea, we will know.

Whether this is a good idea or a bad idea, we will see soon.

Will he break the world record? Still a problem.

Whether he will break the world record is still a question.