to and too to - "I'm going to a movie", "I'm talking to him now" This is generally used when indicating a direction of travel, orientation or goal. too - "I'm tired too!" "He thinks too much" Most often this is used to express agreement, but in the second example you can see how it is used to express when something is excessive. Hope this helps

The other place that 'to' pops up is in infinitives- 'to eat', 'to sleep', etc.