When do we use "like" and when "as"?

[logician]

Test No. incompl/inter-54 "Lots of Stuff", question 2

You know the kind of things politicians talk about: health care, education, welfare and stuff ......... that.

(a) as
(b) with
(c) on
(d) like

Test No. incompl/inter-54 "Lots of Stuff", answer 2

You know the kind of things politicians talk about: health care, education, welfare and stuff like that.

Correct answer: (d) like

Hello! Could you tell me the reason for using word "like". Why I cannot use word "as"?
Thanks
Logician.

[Alan]

Hi Logician,

The expression 'stuff like that' means 'stuff similar to that'. If you use 'as' it would have to be used with a positive comparative: as ... as. The other use of 'as' is when you use it in the sense of a conjunction: They do it the same way as I do.

Alan
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[logician]

Hi Alan! Thank you very much.
Logician.