 And now we'll take a look at the past tenses, first focusing on the past simple tense. Here, the past simple tense is used to express completed actions in the past, whether the past be a few seconds ago, or whether many years or ages ago, doesn't matter. To make positive sentences, we have our subject, and the subject could be anything from I, you, we, they, it, he, she, and now we conjugate. We change our verb, most often by adding ed. For the negative sentences, rather than changing the verb, we add the auxiliary verb. In this case, the auxiliary verb is do. So I've changed do to did to indicate the past, and it results in a sentence structure such as I did not work. Now did not is the full form. Obviously, we can contract this into didn't. Here we have did I work? Again, you can see the inversion of the position of the auxiliary verb and the subject to help us create our question. When we use did, we can use it for any of the subjects in our sentence, from I, or he, or she, etc. In terms of spelling these conjugated verbs, of course, there are some issues that we need to have a look at, especially when considering some patterns. So again, we have our y changes to drop in the y and adding Ied. And when we have a consonant vowel consonant, we double the consonant in question and finally add ed. These aren't irregular verbs. They're just irregular spellings for some verb conjugations. Our irregular verbs change their form altogether. So a few examples would be be changing to was or were, depending on the subject of the sentence, go to went, have to had, give to gave, write to wrote.