What is the differants between:

Question

verbs that are in base form
and
verbs that are not in base form

Answer 1

The base form of a verb is its infinitive form. It's the word you'd look up in a dictionary.

Examples:
Base form: to work
Past tense: worked
Past participle: have worked
Present participle: working

Base form: to think
Past tense: thought
Past participle: have thought
Present participle: thinking

Check these sites for more information:

http://esl.about.com/od/grammarglossary/g/baseform.htm

http://grammar.about.com/od/pq/g/prinptsterm.htm