may have heard versus probably have heard

duiter said:

Hi all,

He 'may have heard' the rumour. With auxillary verbs like "may", the base form "have" is kept.

He 'probably has heard' the rumour. With an adverb like "probably", say 'He probably has...'.

Is there any difference in meaning? (is much better)
'may" means it's possible. "probably" means a more than 50% likelihood.
Thanks

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