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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 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
Students: We have free audio pronunciation exercises.
 RayH's reply was promoted to an answer.
"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.
"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 ....
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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?"
I have joined the two threads, which were responded to by different people.

PLEASE do not post the same question twice.
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
Students: Are you brave enough to let our tutors analyse your pronunciation?
No, don't use "since when" for a future situation.
Just use "when."
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