Basic errors are not your friends. Be sure to avoid them as much as possible by having a look at this wonderful article:
BASIC ERRORS TO AVOID
And do not forget to study those irregular verbs :) If you speak about the past, you must use past tenses and forms consistently. Mixing past and present or infinitive won't do anymore...
Do you need to know more about this? Yes, you do indeed. Have a close look at this information.
