<p>can we say:
1.Jack likes dancing as well as painting.
2.Jack likes dancing, painting as well as boxing.
3.Jack likes dancing, painting and boxing as well.
somebody told me "as well as" cannot be used in listing more than two things(as in 2.)</p>
<p>I’m not sure what your question is:
- is correct, but unclear: does he like both, or does he like dancing as much as he does painting?
- should be Jack likes dancing and painting, and he likes boxing as well–if you’re trying to differentiate the ideas of arty things like dancing and painting from the more manly art of boxing. If you were trying to make a greater distinction still, you would say, Jack likes dancing and painting, but he likes boxing as well.<br>
- should have a comma after the word, painting.
You could say, Jack likes dancing and painting, and boxing as well. The point of that construction is to make a list in which the first two items are more important, and the third less so. There is no need, normally, to make a list using “as well,” unless you are qualifying one of the items on the list.</p>