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if it is seperate words ;
sen de ----> you also, you too, you as well., you either.
sen de gel ---> you also come.
sen de beni seviyor musun ? ----> Do you love me too ?
sen de gitmezsin ---> you wouldnt go either.
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sana da ---> to you too., to you either. [ Dative case of "Sen", bana da = to, Ona da = to him, to her, bize de = to us , size de = to you [plural or polite you ], onlara da = to them ]
bunu sana da s
öylemem lazım ----> I need to tell this to you too. 
