A verb tense on which the verb is happened in the past or it already happened, by adding -d and -ed by a verb, it will be in Past Tense.
I walked yesterday behind my father.
She climbed the tall tree.
A verb tense on which the verb is happening, or it is currently happening, by adding -ing on the verb, the verb will be in Present Tense.
I am talking to my friend.
He is speaking loudly.
A verb tense on which the verb already happened, by putting should or could etc. before the verb, the verb will be in Future Tense.
I should watch a beautiful movie!
She couldn't climb the very tall tree very easy, on the other hand Leo can climb the tree in less than a minute!