Will vs might vs would here
Could you please tell me the difference between these three sentences:
The boss will come to the office at 5.
The boss might come to the office at 5.
The boss would come to the office at 5.
My understanding is that the first sentence means that the boss is defiantly going to come at five.
The second and third mean the exact same that is the boss could come at 5(but he might not come).
Am I correct?