No, it is not! The correct grammar is ...... 'since he joined'
Hope this helped!
He joined us on 26th July
League of Nations is correct. It is a collection of nations that have joined together, in order to promote World Peace.
The correct grammar is "You have been here for four months."
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
"G-R-A-M-M-A-R" (You should know, since you spelled it out in your question.)
No, it is correct grammar, not a correct grammar.
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
The correct grammar for this sentence is: "When did you send it?"
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
No, the correct grammar would be "I hate you the way you hate me."
"July has just been started" is not correct grammar, instead the correct grammar is "July has just started."