''I haven't tell him'' / ''I haven't told him''
Greeting all, how do I describe these two sentences ? I guess one of them might be wrong ..

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"I haven't tell him" - yes, this is wrong. Please take some time to learn basic grammar.

"I haven't told him" is correct. It means that even now, he doesn't know the news from you.

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Can I say What could I did

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''I haven't told him'' this one is correct another is wrong
in grammar book, it is called " present perfect  "
the form of it is : Subject+have/has+ Verb past participle

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"I have not told them" is the correct one. It is in the present perfect tense . It means I did not tell them about that thing before till now.