You speak good...

[Lusenka]

You speak g o o d . Can I tell so?

Lusenka

[Alan]

Hi,

You need the adverb well here and not the adjective good

So we have 'She is a good speaker' but 'She speaks well.'

Alan
_________________
English as a Second Language
You can read my ESL story A spring in your step

[Torsten]

Hi,

To add another example to Alan's explanation:

She speaks good English. (adjective)
She speaks English well. (adverb)
_________________
Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary