Which word will be correct to use in this sentence. And why? Thank you
In cold climates people have to wear thick coats ...... warm.
1. for keeping
2. to keep
3. for to keep

Question

Answer

Hi,
1. To+ infinitive= to express the purpose or the intention.
For example: "I go to the gym to keep fit". 
2. For + ing = to talk about the function of something or the way something is used.
For example: " Chopsticks are used for eating noodles and sushi".
3. For to is completely wrong.

Answer

"To keep warm"