er, I still have some questions:
a) I still/aslo have seen someone use another programming tool.
b) I have still/also seen someone use another programming tool.

The word 'still' or 'also' is not an adverb expressing the frequency, can I still follow teacher RonBee's summary, place it before the main verb but after auxiliary verbs? then the 'a' expression is incorrect, isn't it?

Thanks.