Any party to an action may make written request before the officer taking a deposition therein that it be submitted to the witness. In such event, and when the testimony is fully transcribed, the deposition shall be submitted to the witness for examination and shall be read to or by him. Any changes in form or substance which the witness desires to make shall be entered upon the deposition by the officer with a statement of the reasons given by the witness for making them. The deposition shall then be signed by the witness unless the witness is ill or cannot be found or refuses to sign. If the deposition is not signed by the witness, the officer shall sign it and state on the record the fact of the illness or absence of the witness or the fact of the refusal to sign together with the reason, if any, given therefor; and the deposition may then be used as fully as though signed, unless on a motion to suppress under Rule 32.04 the court holds that the reasons given for the refusal to sign require rejection of the deposition in whole or in part.