Anon, For future reference, I suggest that you form the question with tangible contexts so that we can help you more precisely. Anonymous a lesson/class/book to study English and a lesson/class/book for studying English What you have here is not a tangilbe and sensible sentence. As far as using infinitve and present participle is concerned, it's more complicated than a few explantions.
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Anonymous a lesson/class/book to study English and a lesson/class/book for studying EnglishWhat you have here is not a tangilbe and sensible sentence.
dimsumexpressJust a passing comment on the sample sentences, for whatever it is worth..
We stopped at the station for snacks. This is fine but it's not the present participle form.
Since there is no specific indication of asking about Present Tense, I will let it pass.
2) "For" is not used to before a verb in this sense. Use "to" inste
Fandorinll questions can be kindly forwarded to Mark Swan because I took it from his book.Hi,