2nd from mercury is the quality of your speech along with 2nd bhava. Influence of saturn can make one liar.
Influence of rahu- deceptive speech but very refined if the dispositor is a shubh grah and in good dignity.
Influence of mars- cutting/ anger/ harsh speech

Influence of ketu- can give speech defects/ stammering etc . Or one may not be able to communicate properly . Well placed one can make one expert in spiritual talks.
Influence of shukra - person will talk intelligently , sweetly, diplomatic at times

Influence of Jupiter- person can be a good and wise advisor. Truthful and knowledgeable.
Influence of surya - authoritative/ dominating or at times harsh speech. Afflicted surya and mangal in 2nd to mercury - person may use abusive language/ slangs etc.
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The planet in 2nd bhava and 2nd from mercury , their lords, their dignity all should be taken into consideration.