"? No. It isn’t idiomatic at all.
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AnonymousShould it be "If you excuse me, I am going to go to sleep."?No. It isn’t idiomatic at all. Would could be used in place of will, but the latter is far more common.
HUBLOTWhy is 'll necessary?There’s no grammar rule I can throw at you, since the if-clause isn’t a true conditional. If you’ll excuse me is just an idiomatic and usually polite way to excuse oneself.
AnonymousIf you'll excuse me, I am going to go to sleep.Will is used when you've decided something at the time of speaking. What your sentence means is 'you think that the person you are talking to will excuse you and then you can go to sleep'
AnonymousIf you excuse me, I am going to go to sleep.but the other sentence is c
aseem31Will is used when you've decided something at the time of speaking. What your sentence means is 'you think that the person you are talking to will excuse you and then you can go to sleep'No, it’s just used for politeness.
aseem31but the other sentence is conditional. It says that if you excuse me I'll go to sleep but if you don'