I wonder if the last sentence is grammatically correct. Swan says "Present tenses are often used instead of will + infinitive to refer to the future in subordinate clauses" Practical English Usage, Oxford University Press, 2005, Page 568)
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I auto correct (in my head) my husband when he's talking, lol. He says "supposeably" instead of "supposedly" and it drives me up a wall! I do my best and I try to reread everything before posting just so there aren't any mistakes. My husband also uses bad grammar when talking with the children, but I auto correct out loud with that because I don't want my children using bad grammar. Especially since my son goes to Kindergarten next year.
Source is here
Best Answer
Just a remark, as I have heard non-native speakers get this wrong. We can, and indeed often do, use the present tense to describe the future. However, when we do this, it suggests that the event being described has already been planned.
For example,
"My son starts kindergarten next year." That makes sense, because he's 4 years old. When he's five, he will be in kindergarten.
On the other hand, "OK, we're out of time, I have to go, we finish this conversation tomorrow" is NOT grammatical. This is something non-native speakers say a lot, but that strikes me as wrong. You must say "we'll" here. Does this distinction make sense?