Is it correct to say: "I will do that thing when I will talk to him."?
closed as off topic by Matt Эллен, RegDwigнt♦ Jul 6 '12 at 9:36
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It is ungrammatical. In such cases, English expresses the future with the present tense: I will do that thing when I talk to him. It is also unlikely that a native speaker would say I will do that thing. It would normally be I’ll do that.