Infinitives
An infinitive is to + the verb word
Problem 1 : Purpose ~ infinitives
Remember that an infinitive can express purpose. It is a short form of in order to.
Quote:
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Structure : S + V + C + infinitive (purpose)
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Quote:
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Expression : Sara takes vitamins to feel better
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Avoid expression purpose without the word to in the infinitive. Avoid using for instead of to.
Examples :
Incorrect : Wear several layers of clothing for keep warm
Correct : Wear several layers of clothing to keep warm
Incorrect : David has studied hard the succeed
Correct : David has studied hard to succeed