Only 'saying' is natural here.
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CliveOnly 'saying' is natural here.Can you help me justify this to my friend?
CliveThe verb 'say' can take an object In this case, he is saying 'something' (that you can't hear).The verb 'speak' does not take a object. [ except where the object is a language (He speaks English) and in some unusual cases. ]That's why, in broad terms, you can say He said 'Hello',but you can't say He spoke 'Hello'.CliveLots of thanks.