When do you use structures for purpose? , You use it to indicate the intention or reason behind an action in the main clause, answering "why" or "what for" something was done. For example: I went to the supermarket. Why? to buy some ingredients for dinner., to + base form of the verb, it was the first to invent digital image sensors // the material used to make space suits, in order (not) to + base form of the verb, In order to help astronauts survive, scientists at NASA had to find solutions, so as (not) to + base form, We also go there so as to better understand our own planet., for + noun, for miniature cameras // It’s good for long missions, for + gerund, These cameras were developed for taking pictures in interplanetary missions..

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