John 5:24 “Very truly I tell you, whoever hears my word and believes him who sent me has eternal life and will not be judged but has crossed over from death to life.
John 6:47 Very truly I tell you, the one who believes has eternal life.
I am not disputing any of the verses you are providing here. All of them use third-person indicative present tense. However, John 3:16 does not.