"Since when" usage here right or wrong ?

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Friends, can you check this sentence and tell me I'm using "since when" rightly here or not. I'm confuse regarding the usage of s with become. I'm using these sentence in one discussion forum.

Sentence: Since when he becomes a leader ? and Since when Mugabe becomes a good president ?

Thanks
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Since when did he become a leader?
Since when is he a leader?
Since when did Mugabe become a good president?
Since when is Mugabe a good president?
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Friends, can you check this sentence and tell me I'm using "since when" rightly here or not. I'm confuse regarding the usage of s with become. I'm using these sentence in one discussion forum.

Sentence: Since when he becomes a leader ? and Since when Mugabe becomes a good president ?

Thanks
"Since when" is asking about a past time, so you need to use "became," or "did become," or some other past tense.

If you switch it to a declarative sentence, you have, "He has been a leader since X."

"Mugabe has been a good president since Y."

I guess to be correct, you'd need, "Since when is he a leader?"

"Since when is Mugabe a good president?"

It's casual, right? People say, "Since when did you become boss?"

It's technically incorrect to use "since" with "become" or "became."

"When did he become a leader?"

"When did Mugabe become a good president?"

These are more correct, but lack the touch of sarcasm.
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Anonymous:
"Since when" is very strange. It consists of a preposition (since) and an adverb (when) . As you know, you need a noun after a preposition. So native speakers make "when" into a noun. "Since when" REALLY should be : Since which time. (1)Here's an example: Why do you want me to leave the library now. It's only 3 p.m. (I'm sorry, but we now close at 3 p.m. ) Since when did you start closing so early? (Since last week) (2) Here's another example. Joe started working at that company in 2005, since when he has gone from a cashier to the manager. = Since 2005, he has gone ....
AnonymousFriends, can you check this sentence and tell me I'm using since when rightly or not. I'm confuse regarding the usage of s with become. I'm using these sentence in one discussion forum.

Since when he becomes a leader ? Since when Mugabe becomes a good president ?

Thanks

If you say "Since when has he been a leader?" "Since when has Mugabe been a good president?" you are expressing doubt that he IS a leader or that he IS a good president.

"I"m on a diet.
"Since when? I saw you have ice cream with your lunch!"

If you simply want to know how long, then you ask "How long has X been Y?" or "When did X become Y?"
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I have joined the two threads, which were responded to by different people.

PLEASE do not post the same question twice.
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Anonymous:
My question is also about the usage of the same "since when" but in a different context. can we use this for future especially when we have to take permission for any of our future action; such as, since when shall I come to class etc?

reply soon please.

Thanks
No, don't use "since when" for a future situation.
Just use "when."
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