that the court must explicitly inform the jury that the witness has been sworn. 32 Montes v. State, 262 Ga. 473, 475 (3) (421 SE2d 710) (1992) (citations and punctuation omitted). See also Bennett v. State, 334 Ga. App. 381, 383 (1) (a) (779 SE2d 420) (2015) (“[I]t is well settled that the failure to object to unsworn testimony waives the issue for appeal.”). 33 Strickland v. Washington, 466 U. S. 668 (104 SCt 2052, 80 LE2d 674) (1984). 34 Robinson v. State, 277 Ga. 75, 75-76 (586 SE2d 313) (2003) (citations and punctuation omitted). 35 Grier v. State, 273 Ga. 363, 365 (4) (541 SE2d 369) (2001) (citations and punctuation omitted). 36 Davis v. State, 299 Ga. 180, 191 (2) (c) (787 SE2d 221) (2016) (citation omitted); see also Domingues v. State, 277 Ga. 373, 374 (2) (589 SE2d 102) (2003) (<HOLDING>). 37 Mayes v. State, 229 Ga. App. 372, 373 (1)
holdingthat a defendant could not show prejudice based on his trial counsels alleged failure to thoroughly investigate the case and call potential witnesses because he made no proffer as to what additional investigation would have uncovered or what the witnesses would have said if they had testified holding that where larzelere claimed that trial counsel was ineffective for failing to call a concrete expert defendant failed to prove prejudice because she failed to show what a concrete expert would have testified to or how testimony would have cast doubt on her guilt holding that a claim of failure to call witnesses is deficient of sic it does not show what the witnesses would have testified to and how that testimony might have chanted sic the outcome holding that material for witnesses need not be produced to defendant where the witnesses were not called as government witnesses at trial holding that counsels decision not to call witnesses was unreasonable because counsels stated reasons for disputing the witnesses credibility were not supported by objective evidence