Example 1 I beautiful ,everybody likes me.(I am beautiful)
Example 2:I am feel sorry for him.(feel)
Example 3:I will to work in the factory.(work)
example 1 is short of the auxiliary verb.only be+adjective can be a correct sentence.In example 2,however,the auxiliary verb is redundant,because the finite verb can act as a predicate perfectly.IN example3,infinitive can not be considered as predicate,so we should change it into finite verb.