Answers

2015-11-15T17:58:41+08:00
1.) to eat
2.) to buy
3.) to walk 
4.) to kill
5.) to be 

an infinitive is a word "to" followed by verb so that it will then act as a noun. so if you add to in verb it is not a verb anymore it becomes the subject. any verb that is preceded by the word to is an infinitive
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