I write - this is present tense. Past tense would be I wrote. However, the infinitive "to write" is always present tense. It must be accompanied with a present, future or past tense finite verb. I like to write I will like to write I liked to write
1) present tense - I like ice cream. She likes ice cream too. 2) present continuous tense. - We are having a party. 3) present perfect tense - I have finished my lunch 4) present perfect continuous tense - I have been waiting for you.